return 0; 
return ret; 
long keyctl_revoke_key(key_serial_t id){	struct key *key;	long ret;	key = lookup_user_key(NULL, id, 0, 0, KEY_WRITE);	if (IS_ERR(key)) {		ret = PTR_ERR(key);		goto error;	}	key_revoke(key);	ret = 0;	key_put(key); error:	return 0;} /* end keyctl_revoke_key() */
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/1260f801b4e4ba7be200886b4a53d730de05ca19/keyctl.c/buggy/security/keys/keyctl.c