playlist: wait for preparser end from playlist thread.

src/playlist/engine.c

@@ -170,15 +170,11 @@ static void playlist_Destructor( vlc_object_t * p_this )
 
     if( p_playlist->p_preparse )
     {
-        vlc_object_kill( p_playlist->p_preparse );
-        vlc_thread_join( p_playlist->p_preparse );
         vlc_object_release( p_playlist->p_preparse );
     }
 
     if( p_playlist->p_fetcher )
     {
-        vlc_object_kill( p_playlist->p_fetcher );
-        vlc_thread_join( p_playlist->p_fetcher );
         vlc_object_release( p_playlist->p_fetcher );
     }
     msg_Dbg( p_this, "Destroyed" );
@@ -508,6 +504,11 @@ void playlist_LastLoop( playlist_t *p_playlist )
     playlist_ServicesDiscoveryKillAll( p_playlist );
     playlist_MLDump( p_playlist );
 
+    vlc_object_kill( p_playlist->p_preparse );
+    vlc_thread_join( p_playlist->p_preparse );
+    vlc_object_kill( p_playlist->p_fetcher );
+    vlc_thread_join( p_playlist->p_fetcher );
+
     PL_LOCK;
     FOREACH_ARRAY( playlist_item_t *p_del, p_playlist->all_items )
         free( p_del->pp_children );