playlist: Print a destroyed message when the playlist, fetcher and preparser are destroyed.

src/playlist/engine.c

@@ -173,6 +173,8 @@ static void playlist_Destructor( vlc_object_t * p_this )
 
     if( p_playlist->p_fetcher )
         vlc_object_release( p_playlist->p_fetcher );
+
+    msg_Dbg( p_this, "Destroyed" );
 }
 
 /* Destroy remaining objects */

src/playlist/thread.c

@@ -187,10 +187,12 @@ static void PreparseDestructor( vlc_object_t * p_this )
 {
     playlist_preparse_t * p_preparse = (playlist_preparse_t *)p_this;
     free( p_preparse->pp_waiting );
+    msg_Dbg( p_this, "Destroyed" );
 }
 
 static void FetcherDestructor( vlc_object_t * p_this )
 {
     playlist_fetcher_t * p_fetcher = (playlist_fetcher_t *)p_this;
     free( p_fetcher->pp_waiting );
+    msg_Dbg( p_this, "Destroyed" );
 }