message: [clippy] Re-enable clippy::unnecessary-mut-passed
  Closes:
  Approved by: bmwill
diff: @@ -8,6 +8,4 @@ allowed = [
  "clippy::new_without_default",
  # Deriving Arbitrary often causes this warning to show up.
  "clippy::unit_arg",
  - # Whitelist for now since it seems like the futures::select! macro has an issue with this
  - "clippy::unnecessary-mut-passed",
  ]
  