clang-tidy: Enable readability-implicit-bool

Modified code to address issues flagged by
readability-implicit-bool-conversion check.

Tested: Build and unit tests passed successfully.

Change-Id: Ic7a15466ea628629eb4a98233b12523fbbbe794d
Signed-off-by: Jayanth Othayoth <ojayanth@gmail.com>
diff --git a/.clang-tidy b/.clang-tidy
index c36a725..bce8ba2 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -296,6 +296,7 @@
 readability-deleted-default,
 readability-function-size,
 readability-identifier-naming,
+readability-implicit-bool-conversion
 readability-isolate-declaration,
 readability-misleading-indentation,
 readability-misplaced-array-index,