void crypt_drop_keyring_key(struct crypt_device *cd, struct volume_key *vks)
{
	struct volume_key *vk = vks;

	while (vk) {
		crypt_drop_keyring_key_by_description(cd, vk->key_description, LOGON_KEY);
		vk = crypt_volume_key_next(vk);
	}
}
void crypt_drop_keyring_key(struct crypt_device *cd, struct volume_key *vks)
{
	struct volume_key *vk = vks;

	while (vk) {
		crypt_drop_keyring_key_by_description(cd, vk->key_description, LOGON_KEY);
		vk = crypt_volume_key_next(vk);
	}
}