f Prefer split_at over split_off

Author: tnull

lightning-transaction-sync/src/electrum.rs

@@ -248,9 +248,10 @@ where
 		debug_assert_eq!(num_output_spend_lookups, sync_state.watched_outputs.len());
 
 		match self.client.batch_script_get_history(&watched_script_pubkeys) {
-			Ok(mut tx_results) => {
-				let output_results = tx_results.split_off(num_tx_lookups);
+			Ok(results) => {
+				let (tx_results, output_results) = results.split_at(num_tx_lookups);
 				debug_assert_eq!(num_output_spend_lookups, output_results.len());
+
 				for (i, script_history) in tx_results.iter().enumerate() {
 					let (txid, tx) = &watched_txs[i];
 					let mut filtered_history = script_history.iter().filter(|h| h.tx_hash == **txid);