rinjdael-s390x: fix UBSAN warning on using index beyond end of array
* cipher/rijndael-s390x.c (aes_s390x_ocb_get_l): New. (aes_s390x_ocb_enc, aes_s390x_ocb_dec, aes_s390x_ocb_auth): Use 'aes_s390x_ocb_get_l'.
- Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>