cipher:aeswrap: Fix padding length check.
* cipher/cipher-aeswrap.c (_gcry_cipher_keywrap_decrypt_auto): When padding length is 8, correctly return GPG_ERR_CHECKSUM.
The maximum valid padding is 7B. Thanks coverity scan.
- GnuPG-bug-id: T7130
- Signed-off-by: Jakub Jelen <jjelen@redhat.com>