Assert that we have an object, in case people use inline-C to access

obj.http.*



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4762 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_vrt.c

@@ -115,6 +115,7 @@ vrt_selecthttp(const struct sess *sp, enum gethdr_e where)
 		hp = sp->wrk->resp;
 		break;
 	case HDR_OBJ:
+		CHECK_OBJ_NOTNULL(sp->obj, OBJECT_MAGIC);
 		hp = sp->obj->http;
 		break;
 	default: