Fix warning

Summary:
I'll leave the `todo!()` as-is as I don't have much context for this code and why
the implementation is commented out.

In the meantime, fix the warning for everyone so we can easily detect new ones.

Reviewed By: lmvasquezg

Differential Revision: D64466805

fbshipit-source-id: a51eee7fd7241884c2b0ba7ae70a7eaf102d2a54

eden/mononoke/async_requests/worker/src/methods.rs

@@ -228,7 +228,7 @@ pub(crate) async fn megarepo_async_request_compute<R: MononokeRepo>(
 
  Ok(commit_sparse_profile_size_impl(ctx, repo, changeset, params.profiles)
  .await
- .map_err(|e| todo!() /* AsyncRequestsError::InternalError(anyhow!(e.into())) */ )
+ .map_err(|_e| todo!() /* AsyncRequestsError::InternalError(anyhow!(e.into())) */ )
  .into())
  }
  async_requests_types_thrift::AsynchronousRequestParams::UnknownField(union_tag) => {