The IscsiAIOCB.qiov field has been unused since commit
063c3378 ("block/iscsi: introduce
bdrv_co_{readv, writev, flush_to_disk}") back in 2013.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20170327165005.22038-1-stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>