Tighten format string diagnostic and make it a bit clearer (and a bit closer to GCC's).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@148579 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/SemaObjC/format-strings-objc.m b/test/SemaObjC/format-strings-objc.m
index 29e3a3f..3fb7c9e 100644
--- a/test/SemaObjC/format-strings-objc.m
+++ b/test/SemaObjC/format-strings-objc.m
@@ -47,8 +47,8 @@
 // <rdar://problem/7068334> - Catch use of long long with int arguments.
 void rdar_7068334() {
   long long test = 500;  
-  printf("%i ",test); // expected-warning{{conversion specifies type 'int' but the argument has type 'long long'}}
-  NSLog(@"%i ",test); // expected-warning{{conversion specifies type 'int' but the argument has type 'long long'}}
+  printf("%i ",test); // expected-warning{{format specifies type 'int' but the argument has type 'long long'}}
+  NSLog(@"%i ",test); // expected-warning{{format specifies type 'int' but the argument has type 'long long'}}
 }
 
 // <rdar://problem/7697748>