Add newline at the end of file

Author: bozicrHT

clang/test/Sema/format-strings-nonnull.c

@@ -71,4 +71,4 @@ void check_format_string(FILE *fp, va_list ap) {
 
     vsscanf(buf, NULL, ap);
     // expected-warning@-1{{null passed to a callee that requires a non-null argument}}
-}
+}