macosx: playlistlock is held when playlistinfo panel is updated, so call...

macosx: playlistlock is held when playlistinfo panel is updated, so call PreparseEnqueue with pl_Locked.

updatePanelWithItem is called from modules/gui/macosx/intf.m line 1565 with playlist lock held.
If this solution is wrong then revert and fix properly.

modules/gui/macosx/playlistinfo.m

@@ -252,7 +252,7 @@ static VLCInfo *_o_sharedInstance = nil;
         if( !input_item_IsPreparsed( p_item ) )
         {
             playlist_t * p_playlist = pl_Hold( VLCIntf );
-            playlist_PreparseEnqueue( p_playlist, p_item, pl_Unlocked );
+            playlist_PreparseEnqueue( p_playlist, p_item, pl_Locked );
             pl_Release( VLCIntf );
         }