修复未初始化导致的bug

src/Common/MultiMediaSourceMuxer.h

@@ -156,7 +156,7 @@ protected:
 private:
     RtmpMediaSourceMuxer::Ptr _rtmp;
     RtspMediaSourceMuxer::Ptr _rtsp;
-    Listener *_listener;
+    Listener *_listener = nullptr;
 };
 
 

src/Player/PlayerBase.h

@@ -282,7 +282,7 @@ public:
 protected:
 	void onAddTrack(const Track::Ptr &track);
 protected:
-	Listener *_listener;
+	Listener *_listener = nullptr;
 	AudioTrack::Ptr _audioTrack;
 	VideoTrack::Ptr _videoTrack;
 	Ticker _ticker;