drm: avoid kernel oops in some error paths calling drm_lastclose

	del_timer(&dev->timer);

	/* Clear pid list */

	if (dev->magicfree.next) {

		list_for_each_entry_safe(pt, next, &dev->magicfree, head) {

			list_del(&pt->head);

			drm_ht_remove_item(&dev->magiclist, &pt->hash_item);

			drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);

		}

	}

	/* Clear AGP information */

	if (drm_core_has_AGP(dev) && dev->agp) {