修复性能测试时发现的内存泄漏的问题

entry/src/kni_entry.cpp

@@ -1045,6 +1045,7 @@ static long keepalive_replay_search_cb(void *data, const uchar *key, uint size,
 		KNI_LOG_ERROR(logger, "Failed at send keepalive replay packet to tfe");
 	}
 	value->has_replayed = 1;
+	marsio_buff_free(marsio_handle->instance, &rx_buff, 1, 0, 0);
 	FREE(&replay_packet);
 	return 0;
 }