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/telemetry_service.hpp b/redfish-core/lib/telemetry_service.hpp
index 5457530..421985a 100644
--- a/redfish-core/lib/telemetry_service.hpp
+++ b/redfish-core/lib/telemetry_service.hpp
@@ -58,7 +58,7 @@
                     minInterval = std::get_if<uint64_t>(&var);
                 }
             }
-            if (!maxReports || !minInterval)
+            if (maxReports == nullptr || minInterval == nullptr)
             {
                 BMCWEB_LOG_ERROR
                     << "Property type mismatch or property is missing";