clang-tidy: Enable cert-env33-c

Modified code to address issues flagged by this check.

Tested: Build and unit tests completed successfully.

Change-Id: Ic84d34ce664870988054284ecba4903805037210
Signed-off-by: Jayanth Othayoth <ojayanth@gmail.com>
diff --git a/.clang-tidy b/.clang-tidy
index ae30b79..f333237 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -89,6 +89,7 @@
 cert-dcl54-cpp,
 cert-dcl58-cpp,
 cert-dcl59-cpp,
+cert-env33-c,
 cert-err09-cpp,
 cert-err34-c,
 cert-err52-cpp,