There seems to be a cut-n-paste bug with the name of the buffer being
free'd, xoutbuf should be used instead of axbuf.

Detected by CoverityScan, CID#1463420 ("Copy-paste error")

Fixes: 427988d9 ("crypto: tcrypt - add multibuf aead speed test")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>