mediaplayer: write a break statement

Change-Id: I3cb8a7c6dcd6369b18062677963947fb4a313669
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1837
Reviewed-by: waddlesplash <[email protected]>

src/apps/mediaplayer/ControllerView.cpp

@@ -70,6 +70,7 @@ ControllerView::MessageReceived(BMessage* message)
 
 		default:
 			TransportControlGroup::MessageReceived(message);
+			break;
 	}
 }