Fix for memory leak with single audio player instance

Change-Id: Idb0d24ac1a4fbe21c5f63871a4c7da2beb90e516
diff --git a/libvideoeditor/lvpp/PreviewPlayer.cpp b/libvideoeditor/lvpp/PreviewPlayer.cpp
index 8a3576c..d538eae 100644
--- a/libvideoeditor/lvpp/PreviewPlayer.cpp
+++ b/libvideoeditor/lvpp/PreviewPlayer.cpp
@@ -526,6 +526,11 @@
                     DummyAudioSource *pDummyAudioSource = (DummyAudioSource*)pMediaSrc;
                     //Increment the duration of audio source
                     pDummyAudioSource->setDuration((int64_t)((mPlayEndTimeMsec)*1000));
+
+                    // Stop the new audio source
+                    // since we continue using old source
+                    LOGV("setAudioPlayer: stop new audio source");
+                    mAudioSource->stop();
                 }
             }
         }