crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption

crypto: authencesn - Do not place hiseq at end of dst for out-of-place decryption

When decrypting data that is not in-place (src != dst), there is
no need to save the high-order sequence bits in dst as it could
simply be re-copied from the source.

However, the data to be hashed need to be rearranged accordingly.

Reported-by: Taeyang Lee <0wn@theori.io>
Fixes: 104880a6b470 ("crypto: authencesn - Convert to new AEAD interface")
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Thanks,

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>