Add readability-redundant-* checks

There's a number of redundancies in our code that clang can sanitize
out.  Fix the existing problems, and enable the checks.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ie63d7b7f0777b702fbf1b23a24e1bed7b4f5183b
diff --git a/redfish-core/lib/memory.hpp b/redfish-core/lib/memory.hpp
index 49304e2..f20681b 100644
--- a/redfish-core/lib/memory.hpp
+++ b/redfish-core/lib/memory.hpp
@@ -546,7 +546,7 @@
                             << "Invalid property type for Dimm Presence";
                         return;
                     }
-                    if (*value == false)
+                    if (!*value)
                     {
                         aResp->res.jsonValue["Status"]["State"] = "Absent";
                     }