remove unused code

kamailio/keepalive.cfg

@@ -178,3 +178,9 @@ route[KEEPALIVE_ON_SUBSCRIBE]
      mq_add("keepalive_db_queue", "$ci", "$var(sql)");
    }
 }
+
+route[KEEPALIVE_ON_EXPIRED_REGISTRATION]
+{
+   $var(Query) = $_s(DELETE FROM keepalive where contact like "$ulc(exp=>addr)%");
+   mq_add("keepalive_db_queue", "$uuid(g)", "$var(Query)");
+}