virtio-blk: Convert VirtIOBlockReq.elem to pointer
This will make converging with dataplane code easier. Add virtio_blk_free_request to handle the freeing of request internal fields. Signed-off-by: NFam Zheng <famz@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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