Prior to adding the new "expected-no-diagnostics" directive to VerifyDiagnosticConsumer, make the necessary adjustment to 580 test-cases which will henceforth require this new directive.

llvm-svn: 166280
diff --git a/clang/test/SemaObjCXX/null_objc_pointer.mm b/clang/test/SemaObjCXX/null_objc_pointer.mm
index 0da9e50..e0232bf3 100644
--- a/clang/test/SemaObjCXX/null_objc_pointer.mm
+++ b/clang/test/SemaObjCXX/null_objc_pointer.mm
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -fsyntax-only -verify -Wnull-arithmetic %s
+// expected-no-diagnostics
 #define NULL __null
 
 @interface X