1b1d6ce131
Object freeing may in some kind access its obdata (in case it has some caches e.g.), since here obdata may have already been freed, let's set object's data pointer to NULL (probably not ideal solution, but we don't care much, those form archipelagos of unused linked datablocks, we nuke'em all anyway). Also fix stupid mistake in one of own recent commits (using ID we just freed, tsst...).