virtio-net: remove unused skb_vnet_hdr->num_sg field
[Split from "correct capacity math on ring full" -- Rusty] Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au> Acked-by: NMichael S. Tsirkin <mst@redhat.com>
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