thanks mithrandir -- check the right magic

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@3354 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_vrt.c

@@ -286,7 +286,7 @@ int
 VRT_r_resp_status(const struct sess *sp)
 {
 	CHECK_OBJ_NOTNULL(sp, SESS_MAGIC);
-	CHECK_OBJ_NOTNULL(sp->obj, OBJECT_MAGIC);
+	CHECK_OBJ_NOTNULL(sp->http, HTTP_MAGIC);
 	return (atoi(sp->http->hd[HTTP_HDR_STATUS].b));
 }