key_unlink
rc = key_unlink(keyring, current_key);
key_unlink(get_user_session_keyring(), cs_keyring);
key_unlink(turris_signing_keyring, key);
err = key_unlink(mk->mk_users, mk_user);
extern int key_unlink(struct key *keyring,
ret = key_unlink(keyring, key);
EXPORT_SYMBOL(key_unlink);