message: storage: clear some dead code
  No logic is changed
diff: @@ -117,12 +117,6 @@ where
  drop(guard);
  let result = i.wait_for_inflight(Duration::from_millis(SINGLE_INFLIGHT_WAIT_TIMEOUT));
  if let Err(StorageError::Timeout) = result {
  - /*
  - // Notice that lock of tracer is already dropped.
  - let mut t = self.inflight_tracer.lock().unwrap();
  - t.remove(&index);
  - i.notify();
  - */
  warn!(
  "Waiting for backend IO expires. chunk index {}, compressed offset {}",
  index,
  @@ -131,6 +125,8 @@ where
  Err(StorageError::Timeout)
  } else {
  + // Check if the chunk is ready in local cache again. It should be READY
  + // since wait_for_inflight must return OK in this branch by one more check.
  self.check_ready_and_mark_pending(chunk)
  }
  } else {
  @@ -246,13 +242,10 @@ impl RangeMap for BlobStateMap<IndexedChunkMap, u32> {
  let result =
  i.wait_for_inflight(Duration::from_millis(SINGLE_INFLIGHT_WAIT_TIMEOUT));
  if let Err(StorageError::Timeout) = result {
  - /*
  - // Notice that lock of tracer is already dropped.
  - let mut t = self.inflight_tracer.lock().unwrap();
  - t.remove(&index);
  - i.notify();
  - */
  - warn!("Waiting for backend IO expires. chunk index {}", index,);
  + warn!(
  + "Waiting for range backend IO expires. chunk index {}. range[{}, {}]",
  + index, start, count
  + );
  break;
  };
  if !self.c.is_range_ready(index, 1)? {
  @@ -347,13 +340,10 @@ impl RangeMap for BlobStateMap<BlobRangeMap, u64> {
  let result =
  i.wait_for_inflight(Duration::from_millis(SINGLE_INFLIGHT_WAIT_TIMEOUT));
  if let Err(StorageError::Timeout) = result {
  - /*
  - // Notice that lock of tracer is already dropped.
  - let mut t = self.inflight_tracer.lock().unwrap();
  - t.remove(&index);
  - i.notify();
  - */
  - warn!("Waiting for backend IO expires. chunk index {}", index,);
  + warn!(
  + "Waiting for range backend IO expires. chunk index {}. range[{}, {}]",
  + index, start, count
  + );
  break;
  };
  if !self.c.is_range_ready(idx, 1)? {
  