fix ERROR: t_forward_nonack: no branches for forwarding

kamailio/kamailio.cfg

@@ -663,8 +663,6 @@ failure_route[INTERNAL_FAULT]
 
             remove_hf("X-Redirect-Server");
         }
-
-        route(EXTERNAL_TO_INTERNAL_RELAY);
     } else {
         xlog("L_INFO", "$ci|log|failure route ignoring reply $T_reply_code $rr");