clang-tidy: Enable readability-implicit-bool-conversion check

This check can be used to find implicit conversions between
built-in types and booleans.
the following conversion types are checked:
- integer expression/literal to boolean
- floating expression/literal to boolean
- pointer/pointer to member/nullptr/NULL to boolean
- boolean expression/literal to integer
- boolean expression/literal to floating

Signed-off-by: George Liu <liuxiwei@ieisystem.com>
Change-Id: I3f4bc8902e255d1c85ec57f47d9532ee7326a442
diff --git a/manager/lamptest/lamptest.cpp b/manager/lamptest/lamptest.cpp
index f91a085..f7f9e90 100644
--- a/manager/lamptest/lamptest.cpp
+++ b/manager/lamptest/lamptest.cpp
@@ -246,7 +246,7 @@
 void LampTest::timeOutHandler()
 {
     // set the Asserted property of lamp test to false
-    if (!groupObj)
+    if (groupObj == nullptr)
     {
         lg2::error("the Group object is nullptr");
         throw std::runtime_error("the Group object is nullptr");