message: Bugfix
  Fix memory leak, DoExecTask "arg" new but not delete.
diff: @@ -209,6 +209,7 @@ void PikaClientConn::DoExecTask(void* arg) {
  LogOffset offset = bg_arg->offset;
  std::string table_name = bg_arg->table_name;
  uint32_t partition_id = bg_arg->partition_id;
  + delete bg_arg;
  uint64_t start_us = 0;
  if (g_pika_conf->slowlog_slower_than() >= 0) {
  @@ -231,6 +232,7 @@ void PikaClientConn::DoExecTask(void* arg) {
  if (conn_ptr == nullptr || resp_ptr == nullptr) {
  return;
  }
  +
  conn_ptr->resp_num--;
  *resp_ptr = std::move(cmd_ptr->res().message());
  conn_ptr->TryWriteResp();
  