Enable readability-implicit-bool-conversion checks

These checks ensure that we're not implicitly converting ints or
pointers into bools, which makes the code easier to read.

Tested:
Ran series through redfish service validator.  No changes observed.
UUID failing in Qemu both before and after.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I1ca0be980d136bd4e5474341f4fd62f2f6bbdbae
diff --git a/redfish-core/lib/managers.hpp b/redfish-core/lib/managers.hpp
index c69af7e..549ab2d 100644
--- a/redfish-core/lib/managers.hpp
+++ b/redfish-core/lib/managers.hpp
@@ -500,7 +500,7 @@
                                 {
                                     values = ptr;
                                 }
-                                if (keys && values)
+                                if (keys != nullptr && values != nullptr)
                                 {
                                     if (keys->size() != values->size())
                                     {
@@ -913,7 +913,7 @@
                 return CreatePIDRet::fail;
             }
             if (chassis.empty() &&
-                !findChassis(managedObj, zonesStr[0], chassis))
+                findChassis(managedObj, zonesStr[0], chassis) == nullptr)
             {
                 BMCWEB_LOG_ERROR << "Failed to get chassis from config patch";
                 messages::invalidObject(response->res, it.key());
@@ -1078,7 +1078,7 @@
                 return CreatePIDRet::fail;
             }
             if (chassis.empty() &&
-                !findChassis(managedObj, zonesStrs[0], chassis))
+                findChassis(managedObj, zonesStrs[0], chassis) == nullptr)
             {
                 BMCWEB_LOG_ERROR << "Failed to get chassis from config patch";
                 messages::invalidObject(response->res, it.key());