Emit a warning when the body of an if block is a NullStmt.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@42840 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/default.c b/test/Sema/default.c
index b51ab9a..92f7278 100644
--- a/test/Sema/default.c
+++ b/test/Sema/default.c
@@ -3,6 +3,6 @@
 void f5 (int z) { 
   if (z) 
     default:  // expected-error {{not in switch statement}}
-      ; 
+      ; // expected-warning {{if statement has empty body}}
 }