[Fix] Do not stop monitored on dns errors

src/libutil/map.c

@@ -971,6 +971,8 @@ rspamd_map_dns_callback (struct rdns_reply *reply, void *arg)
 		else {
 			/* We could not resolve host, so cowardly fail here */
 			msg_err_map ("cannot resolve %s", cbd->data->host);
+			cbd->periodic->errored = 1;
+			rspamd_map_periodic_callback (-1, EV_TIMEOUT, cbd->periodic);
 		}
 	}