Fix a bunch of warnings

using the list of warnings from here:
https://github.com/lefticus/cppbestpractices/blob/e73393f25a85f83fed7399d8b65cb117d00b2231/02-Use_the_Tools_Available.md#L100

Seems like a good place to start, and would improve things a bit
type-wise.  This patchset attempts to correct all the issues in one
shot.

Tested:
It builds.  Will test various subsystems that have been touched

Signed-off-by: Ed Tanous <ed.tanous@intel.com>
Change-Id: I588c26440e5a97f718a0f0ea74cc84107d53aa1e
diff --git a/redfish-core/lib/cpudimm.hpp b/redfish-core/lib/cpudimm.hpp
index 2e084d4..d8d4191 100644
--- a/redfish-core/lib/cpudimm.hpp
+++ b/redfish-core/lib/cpudimm.hpp
@@ -63,7 +63,7 @@
         "xyz.openbmc_project.ObjectMapper",
         "/xyz/openbmc_project/object_mapper",
         "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", int32_t(0), collectionName);
+        "/xyz/openbmc_project/inventory", 0, collectionName);
 }
 
 void getCpuDataByInterface(std::shared_ptr<AsyncResp> aResp,
@@ -360,8 +360,8 @@
         "xyz.openbmc_project.ObjectMapper",
         "/xyz/openbmc_project/object_mapper",
         "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", int32_t(0), inventoryItems);
-};
+        "/xyz/openbmc_project/inventory", 0, inventoryItems);
+}
 
 void getDimmDataByService(std::shared_ptr<AsyncResp> aResp,
                           const std::string &dimmId, const std::string &service,
@@ -481,9 +481,9 @@
         "xyz.openbmc_project.ObjectMapper",
         "/xyz/openbmc_project/object_mapper",
         "xyz.openbmc_project.ObjectMapper", "GetSubTree",
-        "/xyz/openbmc_project/inventory", int32_t(0),
+        "/xyz/openbmc_project/inventory", 0,
         std::array<const char *, 1>{"xyz.openbmc_project.Inventory.Item.Dimm"});
-};
+}
 
 class ProcessorCollection : public Node
 {