Remove unnecessary drain

Author: jkczyz

lightning/src/ln/channel.rs

@@ -3588,7 +3588,7 @@ impl<SP: Deref> ChannelContext<SP> where SP::Target: SignerProvider {
 			}
 			bitcoin_tx.txid
 		};
-		let mut htlcs_cloned: Vec<_> = commitment_data.htlcs_included.iter().map(|htlc| (htlc.0.clone(), htlc.1.map(|h| h.clone()))).collect();
+		let htlcs_cloned: Vec<_> = commitment_data.htlcs_included.iter().map(|htlc| (htlc.0.clone(), htlc.1.map(|h| h.clone()))).collect();
 
 		// If our counterparty updated the channel fee in this commitment transaction, check that
 		// they can actually afford the new fee now.
@@ -3627,7 +3627,7 @@ impl<SP: Deref> ChannelContext<SP> where SP::Target: SignerProvider {
 		let holder_keys = commitment_data.stats.tx.trust().keys();
 		let mut nondust_htlc_sources = Vec::with_capacity(commitment_data.stats.tx.htlcs().len());
 		let mut dust_htlcs = Vec::with_capacity(htlcs_cloned.len() - commitment_data.stats.tx.htlcs().len());
-		for (idx, (htlc, mut source_opt)) in htlcs_cloned.drain(..).enumerate() {
+		for (idx, (htlc, mut source_opt)) in htlcs_cloned.into_iter().enumerate() {
 			if let Some(_) = htlc.transaction_output_index {
 				let htlc_tx = chan_utils::build_htlc_transaction(&commitment_txid, commitment_data.stats.tx.feerate_per_kw(),
 					funding.get_counterparty_selected_contest_delay().unwrap(), &htlc, funding.get_channel_type(),