message: [sync]fix fast sync dead loop.
diff: @@ -308,6 +308,13 @@ where
  MIN_BLOCKS_BEHIND
  };
  if (ancestor + min_behind) > latest_number {
  + info!(
  + "do not need sync state : {:?}, {:?}, {:?}",
  + ancestor, min_behind, latest_number
  + );
  + if sync_metadata.get_address().is_none() {
  + let _ = sync_metadata.state_sync_done();
  + }
  return Ok(());
  }
  let pivot = latest_number - min_behind;
  