block/iscsi: drop unused IscsiAIOCB->buf field
The IscsiAIOCB->buf field has not been used since commit
e49ab19fcaa617ad6cdfe1ac401327326b6a2552 ("block/iscsi: bump libiscsi
requirement to 1.9.0"). It used to be a linear buffer for old libiscsi
versions that didn't support scatter-gather. The minimum libiscsi
version supports scatter-gather so we don't linearize buffers anymore.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <
20180203061621.7033-2-stefanha@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>