Copy the key mask to the right offset inside the shadow CRYCB

Fixes: bbeaa58b ("KVM: s390: vsie: support aes dea wrapping keys")
Signed-off-by: NPierre Morel <pmorel@linux.ibm.com>
Reviewed-by: NDavid Hildenbrand <david@redhat.com>
Reviewed-by: NCornelia Huck <cohuck@redhat.com>
Reviewed-by: NJanosch Frank <frankja@linux.ibm.com>
Cc: stable@vger.kernel.org # v4.8+
Message-Id: <1535019956-23539-2-git-send-email-pmorel@linux.ibm.com>
Signed-off-by: NJanosch Frank <frankja@linux.ibm.com>
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>