virtio net: support 'struct virtio_net_hdr_mrg_rxbuf'
virtio net: support 'struct virtio_net_hdr_mrg_rxbuf'

The virtio-net header is sligltly bigger when MRG_RXBUF is negotiated.

Signed-off-by: Nikolay Nikolaev <5fb6ff14f2a3b931c007d120a649a55e86928f6a@virtualopensystems.com>

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