peer: fix logging message when receiving updates for unknown channel

The previous logging message was broken as that target chanpoint was
being overshadowed by the local variable declaration. The new logging
message will properly print the unknown channel point as well as the
peer who sent the message.

peer.go

@@ -450,14 +450,14 @@ out:
 			// Dispatch the commitment update message to the proper
 			// active goroutine dedicated to this channel.
 			p.htlcManMtx.Lock()
-			targetChan, ok := p.htlcManagers[*targetChan]
+			channel, ok := p.htlcManagers[*targetChan]
 			p.htlcManMtx.Unlock()
 			if !ok {
-				peerLog.Errorf("recv'd update for unknown channel %v",
-					targetChan)
+				peerLog.Errorf("recv'd update for unknown "+
+					"channel %v from %v", targetChan, p)
 				continue
 			}
-			targetChan <- nextMsg
+			channel <- nextMsg
 		}
 	}