tweaks

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/live_room/controller.dart

@@ -392,6 +392,7 @@ class LiveRoomController extends GetxController {
       ..removeListener(listener)
       ..dispose();
     pageController?.dispose();
+    danmakuController = null;
     super.onClose();
   }