virtio-scsi: prepare sense data handling for any_layout
Retrieve sense and copy it to guest memory, to prepare for when we will use
qemu_iovec_from_buf.
Swap response and request, since we'll use the tail of VirtIOSCSIReq
for the CDB.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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