new smatch

@@ -1,9 +1,5 @@
 static int foo(void) __attribute__((unknown_attribute));
 
 /*
  * check-name: warn-unknown-attribute
- *
- * check-error-start
-Wunknown-attribute-def.c:1:37: warning: attribute 'unknown_attribute': unknown attribute
- * check-error-end
  */