virtio-blk: modify the value type of num in virtio_queue_rq()
This was found by coccicheck: ./drivers/block/virtio_blk.c, 334, 14-17, WARNING Unsigned expression compared with zero num < 0 Reported-by:Zeal Robot <zealci@zte.com.cn> Signed-off-by:
Ye Guojin <ye.guojin@zte.com.cn> Link: https://lore.kernel.org/r/20211117063955.160777-1-ye.guojin@zte.com.cn Signed-off-by:
Michael S. Tsirkin <mst@redhat.com> Fixes: 02746e26 ("virtio-blk: avoid preallocating big SGL for data") Reviewed-by:
Stefano Garzarella <sgarzare@redhat.com> Reviewed-by:
Max Gurtovoy <mgurtovoy@nvidia.com> Reviewed-by:
Stefan Hajnoczi <stefanha@redhat.com>
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