message: Fix variable shadowing bug in dispatcher_impl.cc
diff: @@ -114,8 +114,8 @@ Status DataServiceDispatcherImpl::WorkerUpdate(
  }
  task->finished = true;
  bool finished = true;
  - for (const auto& task : tasks_by_job_[task->job_id]) {
  - if (!task->finished) {
  + for (const auto& job_task : tasks_by_job_[task->job_id]) {
  + if (!job_task->finished) {
  finished = false;
  break;
  }
  