Revert this, was a bug in my new warning code, not the test case.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@76690 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/2009-06-01-addrofknr.c

@@ -18,5 +18,4 @@ main(int argc, char *argv[])
 
   fp.func = &func;
   fp.func = func;
-  return 0;
 }