crypto: sun8i-ss - fix error codes in allocate_flows()

These failure paths should return -ENOMEM.  Currently they return
success.

Fixes: 359e893e ("crypto: sun8i-ss - rework handling of IV")
Fixes: 8eec4563 ("crypto: sun8i-ss - do not allocate memory when handling hash requests")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>