message: remove an unnecessary `&mut`
diff: @@ -668,7 +668,7 @@ where
  return Some(self.mark_value_as_verified(revision_now));
  }
  - match &mut self.inputs {
  + match &self.inputs {
  // We can't validate values that had untracked inputs; just have to
  // re-execute.
  MemoInputs::Untracked { .. } => {
  