cleanup: Remove all warning errors for the Meson build support

Remove all the build warning to prepare for the meson build.
Meson build will be in
https://gerrit.openbmc-project.xyz/c/openbmc/phosphor-host-ipmid/+/47748

Tested:
Ipmi command works fine the cleanup.
```
$ systemctl status phosphor-ipmi-host
● phosphor-ipmi-host.service - Phosphor Inband IPMI
     Loaded: loaded (/lib/systemd/system/phosphor-ipmi-host.service; enabled; vendor preset: enabled)
     Active: active (running) since Thu 1970-01-08 21:20:56 UTC; 21s ago
   Main PID: 24987 (ipmid)
     CGroup: /system.slice/phosphor-ipmi-host.service
             └─24987 /tmp/ipmid

Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X002B79], Cmd:[0X30] for Ethstats Commands
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X00C2CF], Cmd:[0X30] for Ethstats Commands
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X002B79], Cmd:[0X32] for Sys Commands
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X002B79], Cmd:[0X02] for I2C
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X00C2CF], Cmd:[0X02] for I2C
Jan 08 21:20:56 $HOST ipmid[24987]: I2C_WHITELIST_CHECK is disabled, do not populate whitelist
Jan 08 21:20:56 $HOST ipmid[24987]: Registering OEM:[0X00C2CF], Cmd:[0X04] for Manual Zone Control
Jan 08 21:20:56 $HOST systemd[1]: Started Phosphor Inband IPMI.
Jan 08 21:20:56 $HOST ipmid[24987]: Loading whitelist filter
Jan 08 21:20:56 $HOST ipmid[24987]: Set restrictedMode = true
(reverse-i-search)`ipmi': systemctl status phosphor-^Cmi-host

$ ipmitool mc info
Device ID                 : 32
Device Revision           : 1
Firmware Revision         : 0.00
IPMI Version              : 2.0
Manufacturer ID           : 7244
Manufacturer Name         : Quanta Computer Inc.
Product ID                : 14426 (0x385a)
Product Name              : Unknown (0x385A)
Device Available          : yes
Provides Device SDRs      : yes
Additional Device Support :
    Sensor Device
    SEL Device
    FRU Inventory Device
    Chassis Device
Aux Firmware Rev Info     :
    0x00
    0x00
    0x00
    0x00
```

Change-Id: I372c9433a274bc633a24d213b7a1bc205531e33d
Signed-off-by: Willy Tu <wltu@google.com>
diff --git a/dbus-sdr/sensorcommands.cpp b/dbus-sdr/sensorcommands.cpp
index 8f177e6..4d35009 100644
--- a/dbus-sdr/sensorcommands.cpp
+++ b/dbus-sdr/sensorcommands.cpp
@@ -115,7 +115,7 @@
     *getSdBus(),
     "type='signal',member='InterfacesAdded',arg0path='/xyz/openbmc_project/"
     "sensors/'",
-    [](sdbusplus::message::message& m) {
+    [](sdbusplus::message::message&) {
         getSensorTree().clear();
         sdrLastAdd = std::chrono::duration_cast<std::chrono::seconds>(
                          std::chrono::system_clock::now().time_since_epoch())
@@ -126,7 +126,7 @@
     *getSdBus(),
     "type='signal',member='InterfacesRemoved',arg0path='/xyz/openbmc_project/"
     "sensors/'",
-    [](sdbusplus::message::message& m) {
+    [](sdbusplus::message::message&) {
         getSensorTree().clear();
         sdrLastRemove = std::chrono::duration_cast<std::chrono::seconds>(
                             std::chrono::system_clock::now().time_since_epoch())
@@ -593,11 +593,10 @@
 }
 
 ipmi::RspType<> ipmiSetSensorReading(ipmi::Context::ptr ctx,
-                                     uint8_t sensorNumber, uint8_t operation,
+                                     uint8_t sensorNumber, uint8_t,
                                      uint8_t reading, uint15_t assertOffset,
-                                     bool resvd1, uint15_t deassertOffset,
-                                     bool resvd2, uint8_t eventData1,
-                                     uint8_t eventData2, uint8_t eventData3)
+                                     bool, uint15_t, bool, uint8_t, uint8_t,
+                                     uint8_t)
 {
     std::string connection;
     std::string path;
@@ -946,9 +945,9 @@
     bool lowerCriticalThreshMask, bool lowerNonRecovThreshMask,
     bool upperNonCriticalThreshMask, bool upperCriticalThreshMask,
     bool upperNonRecovThreshMask, uint2_t reserved, uint8_t lowerNonCritical,
-    uint8_t lowerCritical, uint8_t lowerNonRecoverable,
+    uint8_t lowerCritical, [[maybe_unused]] uint8_t lowerNonRecoverable,
     uint8_t upperNonCritical, uint8_t upperCritical,
-    uint8_t upperNonRecoverable)
+    [[maybe_unused]] uint8_t upperNonRecoverable)
 {
     if (sensorNum == reservedSensorNumber || reserved)
     {
@@ -1800,7 +1799,7 @@
 
 #ifdef FEATURE_HYBRID_SENSORS
 // Construct a type 1 SDR for discrete Sensor typed sensor.
-void constructStaticSensorSdr(ipmi::Context::ptr ctx, uint16_t sensorNum,
+void constructStaticSensorSdr(ipmi::Context::ptr, uint16_t sensorNum,
                               uint16_t recordID,
                               ipmi::sensor::IdInfoMap::const_iterator sensor,
                               get_sdr::SensorDataFullRecord& record)
@@ -2049,7 +2048,7 @@
     if (std::find(interfaces.begin(), interfaces.end(),
                   sensor::sensorInterface) != interfaces.end())
     {
-        get_sdr::SensorDataFullRecord record = {0};
+        get_sdr::SensorDataFullRecord record = {};
 
         // If the request doesn't read SDR body, construct only header and key
         // part to avoid additional DBus transaction.
@@ -2075,7 +2074,7 @@
         getSensorEventTypeFromPath(path) !=
             static_cast<uint8_t>(SensorEventTypeCodes::threshold))
     {
-        get_sdr::SensorDataFullRecord record = {0};
+        get_sdr::SensorDataFullRecord record = {};
 
         // If the request doesn't read SDR body, construct only header and key
         // part to avoid additional DBus transaction.
@@ -2099,7 +2098,7 @@
     if (std::find(interfaces.begin(), interfaces.end(), sensor::vrInterface) !=
         interfaces.end())
     {
-        get_sdr::SensorDataEventRecord record = {0};
+        get_sdr::SensorDataEventRecord record = {};
 
         // If the request doesn't read SDR body, construct only header and key
         // part to avoid additional DBus transaction.