vkr: fix segfault in object cleanup path
RELEASE_TRACKED_OBJECTS(&((struct vkr_descriptor_pool *)obj)->descriptor_sets)
was expanded to
struct vkr_object *obj, *tmp;
LIST_FOR_EACH_ENTRY_SAFE(obj, tmp, &((struct vkr_descriptor_pool *)obj)->descriptor_sets), track_head)
util_hash_table_remove_u64(ctx->object_table, _obj->id);
where obj
was garbage.