iscsi: drop unused IscsiAIOCB.qiov field
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: NStefan Hajnoczi <stefanha@redhat.com> Message-Id: <20170327165005.22038-1-stefanha@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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