Fix some warnings by cppcheck

Warning message:
../../../occ_events.hpp:16:9: warning: Value stored to 'event' is never read [deadcode.DeadStores]
        event = sd_event_unref(event);
        ^       ~~~~~~~~~~~~~~~~~~~~~
../../../occ_events.hpp:26:9: warning: Value stored to 'eventSource' is never read [deadcode.DeadStores]
        eventSource = sd_event_source_unref(eventSource);

occ_dbus.cpp:34:47: performance: Searching before insertion is not necessary. [stlFindInsert]
            path, std::make_unique<SensorIntf>(utils::getBus(), path.c_str()));
                                              ^
occ_dbus.cpp:61:47: performance: Searching before insertion is not necessary. [stlFindInsert]
            path, std::make_unique<SensorIntf>(utils::getBus(), path.c_str()));
                                              ^
occ_dbus.cpp:88:47: performance: Searching before insertion is not necessary. [stlFindInsert]
            path, std::make_unique<SensorIntf>(utils::getBus(), path.c_str()));
                                              ^
occ_dbus.cpp:115:47: performance: Searching before insertion is not necessary. [stlFindInsert]
            path, std::make_unique<SensorIntf>(utils::getBus(), path.c_str()));
                                              ^
occ_dbus.cpp:158:80: performance: Searching before insertion is not necessary. [stlFindInsert]
        operationalStatus.emplace(path, std::make_unique<OperationalStatusIntf>(
                                                                               ^
occ_pass_through.hpp:42:5: style: Class 'PassThrough' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
    PassThrough(const char* path);
    ^
powercap.hpp:41:5: style: Class 'PowerCap' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
    PowerCap(Status& occStatus,
    ^
occ_manager.hpp:77:5: style: Struct 'Manager' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
    Manager(EventPtr& event) :
    ^
occ_status.hpp:307:26: style: Local variable 'path' shadows outer variable [shadowVariable]
                    auto path = fs::path(estimatedPath);
                         ^
occ_status.hpp:207:17: note: Shadowed declaration
    std::string path;
                ^
occ_status.hpp:307:26: note: Shadow variable
                    auto path = fs::path(estimatedPath);
                         ^
pldm.hpp:55:14: warning: Member variable 'Interface::OCCSensorOffset' is not initialized in the constructor. [uninitMemberVar]
    explicit Interface(
             ^
pldm.hpp:55:14: warning: Member variable 'Interface::SBESensorOffset' is not initialized in the constructor. [uninitMemberVar]
    explicit Interface(
             ^
powermode.hpp:60:5: style: Class 'PowerMode' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
    PowerMode(Status& occStatus) :
    ^
powermode.hpp:96:5: style: Class 'PowerIPS' has a constructor with 1 argument that is not explicit. [noExplicitConstructor]
    PowerIPS(Status& occStatus) :
    ^
occ_manager.cpp:321:24: style: The scope of the variable 'path' can be reduced. [variableScope]
        constexpr auto path = "/org/openpower/dump";
                       ^
occ_manager.cpp:322:24: style: The scope of the variable 'interface' can be reduced. [variableScope]
        constexpr auto interface = "xyz.openbmc_project.Dump.Create";
                       ^
occ_manager.cpp:323:24: style: The scope of the variable 'function' can be reduced. [variableScope]
        constexpr auto function = "CreateDump";
                       ^
pldm.cpp:78:16: style: Local variable 'pdr' shadows outer variable [shadowVariable]
    for (auto& pdr : pdrs)
               ^
pldm.cpp:48:10: note: Shadowed declaration
    auto pdr =
         ^
pldm.cpp:78:16: note: Shadow variable
    for (auto& pdr : pdrs)
               ^
pldm.cpp:248:16: style: Local variable 'pdr' shadows outer variable [shadowVariable]
    for (auto& pdr : pdrs)
               ^
pldm.cpp:221:10: note: Shadowed declaration
    auto pdr =
         ^
pldm.cpp:248:16: note: Shadow variable
    for (auto& pdr : pdrs)
               ^
powermode.cpp:28:22: style: Variable 'pmode' is assigned a value that is never used. [unreadVariable]
    SysPwrMode pmode = SysPwrMode::NO_CHANGE;

Tested: Use cppcheck to build successfully and eliminate the above
warning message.

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I72751dc94db684fc558b4bb57b1924be64ce6760
diff --git a/file.hpp b/file.hpp
index 9ad5213..7e65758 100644
--- a/file.hpp
+++ b/file.hpp
@@ -25,7 +25,7 @@
      *
      *  @param[in] fd - File descriptor
      */
-    FileDescriptor(int fd) : fd(fd)
+    explicit FileDescriptor(int fd) : fd(fd)
     {
         // Nothing
     }
diff --git a/occ_dbus.cpp b/occ_dbus.cpp
index aaaf1c6..6bc1a46 100644
--- a/occ_dbus.cpp
+++ b/occ_dbus.cpp
@@ -28,7 +28,7 @@
         return false;
     }
 
-    if (sensors.find(path) == sensors.end())
+    if (!sensors.contains(path))
     {
         sensors.emplace(
             path, std::make_unique<SensorIntf>(utils::getBus(), path.c_str()));
@@ -55,7 +55,7 @@
         return false;
     }
 
-    if (sensors.find(path) == sensors.end())
+    if (!sensors.contains(path))
     {
         sensors.emplace(
             path, std::make_unique<SensorIntf>(utils::getBus(), path.c_str()));
@@ -82,7 +82,7 @@
         return false;
     }
 
-    if (sensors.find(path) == sensors.end())
+    if (!sensors.contains(path))
     {
         sensors.emplace(
             path, std::make_unique<SensorIntf>(utils::getBus(), path.c_str()));
@@ -109,7 +109,7 @@
         return false;
     }
 
-    if (sensors.find(path) == sensors.end())
+    if (!sensors.contains(path))
     {
         sensors.emplace(
             path, std::make_unique<SensorIntf>(utils::getBus(), path.c_str()));
@@ -153,7 +153,7 @@
         return false;
     }
 
-    if (operationalStatus.find(path) == operationalStatus.end())
+    if (!operationalStatus.contains(path))
     {
         operationalStatus.emplace(path, std::make_unique<OperationalStatusIntf>(
                                             utils::getBus(), path.c_str()));
diff --git a/occ_events.hpp b/occ_events.hpp
index 26318e8..aa0120c 100644
--- a/occ_events.hpp
+++ b/occ_events.hpp
@@ -13,7 +13,7 @@
 {
     void operator()(sd_event* event) const
     {
-        event = sd_event_unref(event);
+        sd_event_unref(event);
     }
 };
 using EventPtr = std::unique_ptr<sd_event, EventDeleter>;
@@ -23,7 +23,7 @@
 {
     void operator()(sd_event_source* eventSource) const
     {
-        eventSource = sd_event_source_unref(eventSource);
+        sd_event_source_unref(eventSource);
     }
 };
 using EventSourcePtr = std::unique_ptr<sd_event_source, EventSourceDeleter>;
diff --git a/occ_manager.cpp b/occ_manager.cpp
index 33711be..9b6f1c5 100644
--- a/occ_manager.cpp
+++ b/occ_manager.cpp
@@ -318,10 +318,6 @@
 
     if (sbeCanDump(instance))
     {
-        constexpr auto path = "/org/openpower/dump";
-        constexpr auto interface = "xyz.openbmc_project.Dump.Create";
-        constexpr auto function = "CreateDump";
-
         log<level::INFO>("HRESET failed, triggering SBE dump",
                          entry("SBE=%d", instance));
 
@@ -333,6 +329,10 @@
 
         try
         {
+            constexpr auto path = "/org/openpower/dump";
+            constexpr auto interface = "xyz.openbmc_project.Dump.Create";
+            constexpr auto function = "CreateDump";
+
             std::string service = utils::getService(path, interface);
             auto method =
                 bus.new_method_call(service.c_str(), path, interface, function);
diff --git a/occ_manager.hpp b/occ_manager.hpp
index 97bf2b1..e9a469c 100644
--- a/occ_manager.hpp
+++ b/occ_manager.hpp
@@ -74,7 +74,7 @@
      *
      *  @param[in] event - Unique ptr reference to sd_event
      */
-    Manager(EventPtr& event) :
+    explicit Manager(EventPtr& event) :
         event(event), pollInterval(defaultPollingInterval),
         sdpEvent(sdeventplus::Event::get_default()),
         _pollTimer(
diff --git a/occ_pass_through.hpp b/occ_pass_through.hpp
index 185db79..a1e1e91 100644
--- a/occ_pass_through.hpp
+++ b/occ_pass_through.hpp
@@ -39,7 +39,7 @@
     /** @brief Ctor to put pass-through d-bus object on the bus
      *  @param[in] path - Path to attach at
      */
-    PassThrough(const char* path);
+    explicit PassThrough(const char* path);
 
     /** @brief Pass through command to OCC from dbus
      *  @param[in] command - command to pass-through
diff --git a/occ_status.hpp b/occ_status.hpp
index 1cbcdb3..e8e4530 100644
--- a/occ_status.hpp
+++ b/occ_status.hpp
@@ -304,9 +304,9 @@
                 auto& name = std::get<1>(it->second);
                 if (!name.empty() && name != "None")
                 {
-                    auto path = fs::path(estimatedPath);
-                    path.replace_filename(name);
-                    return path.string();
+                    auto objectPath = fs::path(estimatedPath);
+                    objectPath.replace_filename(name);
+                    return objectPath.string();
                 }
             }
         }
diff --git a/pldm.cpp b/pldm.cpp
index 6c177fc..43b86ab 100644
--- a/pldm.cpp
+++ b/pldm.cpp
@@ -45,10 +45,11 @@
     }
 
     bool offsetFound = false;
-    auto pdr =
+    auto stateSensorPDR =
         reinterpret_cast<const pldm_state_sensor_pdr*>(pdrs.front().data());
-    auto possibleStatesPtr = pdr->possible_states;
-    for (auto offset = 0; offset < pdr->composite_sensor_count; offset++)
+    auto possibleStatesPtr = stateSensorPDR->possible_states;
+    for (auto offset = 0; offset < stateSensorPDR->composite_sensor_count;
+         offset++)
     {
         auto possibleStates =
             reinterpret_cast<const state_sensor_possible_states*>(
@@ -218,10 +219,11 @@
     }
 
     bool offsetFound = false;
-    auto pdr =
+    auto stateEffecterPDR =
         reinterpret_cast<const pldm_state_effecter_pdr*>(pdrs.front().data());
-    auto possibleStatesPtr = pdr->possible_states;
-    for (auto offset = 0; offset < pdr->composite_effecter_count; offset++)
+    auto possibleStatesPtr = stateEffecterPDR->possible_states;
+    for (auto offset = 0; offset < stateEffecterPDR->composite_effecter_count;
+         offset++)
     {
         auto possibleStates =
             reinterpret_cast<const state_effecter_possible_states*>(
@@ -230,7 +232,7 @@
         if (possibleStates->state_set_id == stateSetId)
         {
             stateIdPos = offset;
-            effecterCount = pdr->composite_effecter_count;
+            effecterCount = stateEffecterPDR->composite_effecter_count;
             offsetFound = true;
             break;
         }
diff --git a/pldm.hpp b/pldm.hpp
index 2f861b8..ccfb3f9 100644
--- a/pldm.hpp
+++ b/pldm.hpp
@@ -157,12 +157,12 @@
     /** @brief Sensor offset of OCC state set ID
      * PLDM_STATE_SET_OPERATIONAL_RUNNING_STATUS in state sensor PDR.
      */
-    SensorOffset OCCSensorOffset;
+    SensorOffset OCCSensorOffset = 0;
 
     /** @brief Sensor offset of the SBE state set ID
      * PLDM_OEM_IBM_SBE_HRESET_STATE in state sensor PDR.
      */
-    SensorOffset SBESensorOffset;
+    SensorOffset SBESensorOffset = 0;
 
     /** @brief OCC Instance mapping to PLDM Effecter ID
      */
diff --git a/powercap.hpp b/powercap.hpp
index 58070ba..6dab352 100644
--- a/powercap.hpp
+++ b/powercap.hpp
@@ -38,8 +38,8 @@
      *
      * @param[in] occStatus - The occ status object
      */
-    PowerCap(Status& occStatus,
-             const std::string& occMasterName = OCC_MASTER_NAME) :
+    explicit PowerCap(Status& occStatus,
+                      const std::string& occMasterName = OCC_MASTER_NAME) :
         occMasterName(occMasterName),
         occStatus(occStatus),
         pcapMatch(
diff --git a/powermode.cpp b/powermode.cpp
index a78c37e..e87b921 100644
--- a/powermode.cpp
+++ b/powermode.cpp
@@ -25,8 +25,6 @@
         return;
     }
 
-    SysPwrMode pmode = SysPwrMode::NO_CHANGE;
-
     std::map<std::string, std::variant<std::string>> properties{};
     std::string interface;
     std::string propVal;
@@ -36,9 +34,8 @@
     {
         auto modeEntryValue = modeEntry->second;
         propVal = std::get<std::string>(modeEntryValue);
-        pmode = convertStringToMode(propVal);
 
-        if (pmode != SysPwrMode::NO_CHANGE)
+        if (convertStringToMode(propVal) != SysPwrMode::NO_CHANGE)
         {
             log<level::INFO>(
                 fmt::format("Power Mode Change Requested: {}", propVal)
diff --git a/powermode.hpp b/powermode.hpp
index c9d3f0e..0d337dc 100644
--- a/powermode.hpp
+++ b/powermode.hpp
@@ -57,7 +57,7 @@
      *
      * @param[in] occStatus - The occ status object
      */
-    PowerMode(Status& occStatus) :
+    explicit PowerMode(Status& occStatus) :
         occStatus(occStatus),
         pmodeMatch(utils::getBus(),
                    sdbusplus::bus::match::rules::propertiesChanged(
@@ -93,7 +93,7 @@
      *
      * @param[in] occStatus - The occ status object
      */
-    PowerIPS(Status& occStatus) :
+    explicit PowerIPS(Status& occStatus) :
         occStatus(occStatus),
         ipsMatch(utils::getBus(),
                  sdbusplus::bus::match::rules::propertiesChanged(