fix cppcheck warning

- Fix warnings:
  [noExplicitConstructor]
  ipmi/manualcmds.hpp:20:5: style: Class 'ZoneControlIpmiHandler' has a
      constructor with 1 argument that is not explicit.

  [redundantInitialization]
  dbus/dbusutil.cpp:96:15: style: Redundant initialization for 'layer'.
      The initialized value is overwritten before it is read.

  [uninitMemberVar]
  pid/pidcontroller.hpp:23:5: warning: Member variable
      'PIDController::_pid_info' is not initialized in the constructor.

  [memsetClassFloat]
  pid/util.cpp:29:10: portability: Using memset() on struct which
      contains a floating point number.

  [constParameter]
  ipmi/manualcmds.cpp:108:72: style: Parameter 'dataLen' can be
      declared as pointer to const

Signed-off-by: Harvey Wu <Harvey.Wu@quantatw.com>
Change-Id: Ib368c6e3a609e446529573cd0b9fa03858232db1
diff --git a/ipmi/manualcmds.cpp b/ipmi/manualcmds.cpp
index 1622e2e..0967539 100644
--- a/ipmi/manualcmds.cpp
+++ b/ipmi/manualcmds.cpp
@@ -105,7 +105,8 @@
  * </method>
  */
 ipmi_ret_t ZoneControlIpmiHandler::setManualModeState(
-    const uint8_t* reqBuf, [[maybe_unused]] uint8_t* replyBuf, size_t* dataLen)
+    const uint8_t* reqBuf, [[maybe_unused]] uint8_t* replyBuf,
+    const size_t* dataLen)
 {
     if (*dataLen < sizeof(struct FanCtrlRequestSet))
     {