f use persist_res for persistence res of a new monitor

Author: TheBlueMatt

lightning/src/chain/chainmonitor.rs

@@ -372,12 +372,12 @@ where C::Target: chain::Filter,
 				return Err(ChannelMonitorUpdateErr::PermanentFailure)},
 			hash_map::Entry::Vacant(e) => e,
 		};
-		let update_res = self.persister.persist_new_channel(funding_outpoint, &monitor);
-		if update_res.is_err() {
-			log_error!(self.logger, "Failed to persist new channel data: {:?}", update_res);
+		let persist_res = self.persister.persist_new_channel(funding_outpoint, &monitor);
+		if persist_res.is_err() {
+			log_error!(self.logger, "Failed to persist new channel data: {:?}", persist_res);
 		}
-		if update_res == Err(ChannelMonitorUpdateErr::PermanentFailure) {
-			return update_res;
+		if persist_res == Err(ChannelMonitorUpdateErr::PermanentFailure) {
+			return persist_res;
 		}
 		{
 			let funding_txo = monitor.get_funding_txo();
@@ -388,7 +388,7 @@ where C::Target: chain::Filter,
 			}
 		}
 		entry.insert(MonitorHolder { monitor });
-		update_res
+		persist_res
 	}
 
 	/// Note that we persist the given `ChannelMonitor` update while holding the