message: op-node: Preallocate slice
diff: @@ -164,7 +164,7 @@ func (co *ChannelOut) OutputFrame(w *bytes.Buffer, maxSize uint64) error {
  // blockToBatch transforms a block into a batch object that can easily be RLP encoded.
  func blockToBatch(block *types.Block) (*BatchData, error) {
  - var opaqueTxs []hexutil.Bytes
  + opaqueTxs := make([]hexutil.Bytes, 0, len(block.Transactions()))
  for i, tx := range block.Transactions() {
  if tx.Type() == types.DepositTxType {
  continue
  