message: remove non necessary clone
diff: @@ -229,7 +229,7 @@ impl<'a> Peer<'a> {
  date: BlockDate::Genesis(self.blockchain.config.epoch_start)
  }, true);
  let our_tip = match self.blockchain.storage.get_block_from_tag(&self.tag) {
  - Err(storage::Error::NoSuchTag) => genesis_ref.clone(),
  + Err(storage::Error::NoSuchTag) => genesis_ref,
  Err(err) => panic!(err),
  Ok(block) => {
  let header = block.get_header();
  