A failure of sahara_hw_descriptor_create() with -EINVAL due to scatter list
out of bounds/invalid would not be reported back. This patch just passes on
the -EINVAL so it is visible in sahara_queue_manage().
Signed-off-by: NNicholas Mc Guire <hofrat@osadl.org>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>