route: fix previous commit

(cherry picked from commit d866688)

route.c

@@ -300,9 +300,6 @@ void unref_script_route(struct script_route_ref *ref)
 
 int update_script_route_ref(struct script_route_ref *ref)
 {
-	if (!ref)
-		return;
-
 	LM_DBG("updating %p [%.*s], idx=%d, ver/cnt %d\n",
 		ref, ref->name.len, ref->name.s, ref->idx, ref->u.version);
 
@@ -1477,7 +1474,7 @@ static int fix_actions(struct action* a)
 						return ret;
 				}
 				rt_ref = (struct script_route_ref*)(t->elem[1].u.data);
-				if ( update_script_route_ref( rt_ref ) !=0 ) {
+				if (rt_ref && update_script_route_ref( rt_ref ) !=0 ) {
 					LM_ERR("async/launch resume route [%s] is not defined\n",
 						rt_ref->name.s);
 					ret = E_CFG;