message: [tf.data service] Fix uninitialized field asan error.
diff: @@ -164,6 +164,7 @@ Status DataServiceWorkerImpl::GetElementResult(
  if (finished_tasks_.contains(request->task_id())) {
  VLOG(3) << "Task is already finished";
  result->end_of_sequence = true;
  + result->skip = false;
  return Status::OK();
  } else {
  // Perhaps the workers hasn't gotten the task from the dispatcher yet.
  