修复rtsp推流服务器在udp模式下的bug

优化代码

src/Rtsp/RtspPusher.cpp

@@ -63,12 +63,17 @@ void RtspPusher::publish(const string &strUrl) {
 }
 
 void RtspPusher::onPublishResult(const SockException &ex) {
-    _pPublishTimer.reset();
-    if(_onPublished){
-        _onPublished(ex);
-        _onPublished = nullptr;
-    }else if(_onShutdown){
-        _onShutdown(ex);
+    if(_pPublishTimer){
+        //播放结果回调
+        _pPublishTimer.reset();
+        if(_onPublished){
+            _onPublished(ex);
+        }
+    } else {
+        //播放成功后异常断开回调
+        if(_onShutdown){
+            _onShutdown(ex);
+        }
     }
 
     if(ex){