f - simplify pushing sig on tx

Author: alecchendev

lightning/src/chain/channelmonitor.rs

@@ -2818,11 +2818,9 @@ impl<Signer: WriteableEcdsaChannelSigner> ChannelMonitorImpl<Signer> {
 			self.counterparty_commitment_params.on_counterparty_tx_csv, &delayed_key);
 
 		let sig = self.onchain_tx_handler.signer.sign_justice_revoked_output(&justice_tx, input_idx, value, &per_commitment_key, &self.onchain_tx_handler.secp_ctx)?;
-		let mut ser_sig = sig.serialize_der().to_vec();
-		ser_sig.push(EcdsaSighashType::All as u8);
-		justice_tx.input[input_idx].witness.push(ser_sig);
-		justice_tx.input[input_idx].witness.push(vec!(1));
-		justice_tx.input[input_idx].witness.push(revokeable_redeemscript.clone().into_bytes());
+		justice_tx.input[input_idx].witness.push_bitcoin_signature(&sig.serialize_der(), EcdsaSighashType::All);
+		justice_tx.input[input_idx].witness.push(&[1u8]);
+		justice_tx.input[input_idx].witness.push(revokeable_redeemscript.clone().as_bytes());
 		Ok(justice_tx)
 	}