Clang warnings (#7090)
* clang_warnings: Fix unecessary comparison Netdata was verifying whether a pointer that will never be NULL could be NULL. This commit removes this * clang_warnings: Fix unecessary comparison Netdata was doing another unecessary comparison in other file * clang_warnings: Unecessary parenthesis This commit removes the excess of parenthesis in a file * clang_warnings: Remove unecessary initialization Remove from json file a initial set that is overwritten few lines late * clang_warnings: Comments Fix comments on top of the function * clang_warnings: Missing Cast Volatile variable generates warnings with Clang sometimes, so it was necessary to cast variables * clang_warnings: Return from previous Considering the possible problems given by the solution, I am returning for the previous stage