Unlink second VK after deactivating volume during reencryption

Issue description

After closing a device which is in re-encryption, the second volume key is not unlinked from the thread keyring.

Steps for reproducing the issue

Add api-test-2 like so:

static void ReencryptionUnlink(void)
{
	struct crypt_pbkdf_type pbkdf = {
		.type = CRYPT_KDF_ARGON2I,
		.hash = "sha256",
		.parallel_threads = 1,
		.max_memory_kb = 128,
		.iterations = 4,
		.flags = CRYPT_PBKDF_NO_BENCHMARK
	};
	struct crypt_params_luks2 params2 = {
		.pbkdf = &pbkdf,
		.sector_size = 4096
	};
	struct crypt_params_reencrypt retparams = {}, rparams = {
		.direction = CRYPT_REENCRYPT_FORWARD,
		.resilience = "checksum",
		.hash = "sha256",
		.luks2 = &params2,
	};
	uint64_t r_header_size;
 
	OK_(get_luks2_offsets(1, 0, 0, &r_header_size, NULL));
	OK_(create_dmdevice_over_loop(L_DEVICE_OK, r_header_size + 16));
 
	OK_(crypt_init(&cd, DMDIR L_DEVICE_OK));
	OK_(crypt_format(cd, CRYPT_LUKS2, "aes", "cbc-essiv:sha256", NULL, NULL, 32, &params2));
	OK_(crypt_set_pbkdf_type(cd, &pbkdf));
	EQ_(crypt_keyslot_add_by_volume_key(cd, 1, NULL, 64, PASSPHRASE, strlen(PASSPHRASE)), 1);
	EQ_(crypt_keyslot_add_by_key(cd, 0, NULL, 32, PASSPHRASE, strlen(PASSPHRASE), CRYPT_VOLUME_KEY_NO_SEGMENT), 0);
	rparams.flags = CRYPT_REENCRYPT_INITIALIZE_ONLY;
	EQ_(crypt_reencrypt_init_by_passphrase(cd, NULL, PASSPHRASE, strlen(PASSPHRASE), 1, 0, "aes", "xts-plain64", &rparams), 2);
 
	EQ_(crypt_activate_by_passphrase(cd, CDEVICE_1, CRYPT_ANY_SLOT, PASSPHRASE, strlen(PASSPHRASE), 0), 0);
	NOTFAIL_(_kernel_key_by_segment_and_type(cd, 0, "logon"), "dm-crypt VK was not uploaded in thread kernel keyring.");
	NOTFAIL_(_kernel_key_by_segment_and_type(cd, 1, "logon"), "dm-crypt VK was not uploaded in thread kernel keyring.");
	OK_(crypt_deactivate(cd, CDEVICE_1));
 
	FAIL_(_kernel_key_by_segment_and_type(cd, 0, "logon"), "dm-crypt VK remain linked in thread keyring.");
	FAIL_(_kernel_key_by_segment_and_type(cd, 1, "logon"), "dm-crypt VK remain linked in thread keyring.");
 
	CRYPT_FREE(cd);
	_cleanup_dmdevices();
}