Simplify code

relay.go

@@ -431,9 +431,7 @@ func newCall(mainOffer receivedSignal, r *activeRelay) {
 				select {
 				case t := <-localTrackChan:
 					localTracks = append(localTracks, t)
-					if len(localTracks) >= numberTracks {
-						stopCheck = true
-					}
+					stopCheck = len(localTracks) >= numberTracks
 				case <-time.After(time.Millisecond * 1000):
 					stopCheck = true
 				}