if (work_slab) kmem_cache_destroy(work_slab);
static void __exit tgt_exit(void){	if (cmnd_slab)		kmem_cache_destroy(cmnd_slab);	if (work_slab)		kmem_cache_destroy(work_slab);	if (nls)		sock_release(nls->sk_socket);	tgt_sysfs_exit();}