s390/pkey_pckmo: Return with success for valid protected key types

The key_to_protkey handler function in module pkey_pckmo should return
with success on all known protected key types, including the new types
introduced by fd197556 ("s390/pkey: Add AES xts and HMAC clear key
token support").

Fixes: fd197556 ("s390/pkey: Add AES xts and HMAC clear key token support")
Signed-off-by: Holger Dengler <dengler@linux.ibm.com>
Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

drivers/s390/crypto/pkey_pckmo.c

@@ -324,6 +324,7 @@ static int pckmo_key2protkey(const u8 *key, u32 keylen,
 		memcpy(protkey, t->protkey, t->len);
 		*protkeylen = t->len;
 		*protkeytype = t->keytype;
+		rc = 0;
 		break;
 	}
 	case TOKVER_CLEAR_KEY: {