virtio: fix net driver loop case where we fail to restart
skb is only NULL the first time around: it's more correct to test for
being under-budget.
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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skb is only NULL the first time around: it's more correct to test for
being under-budget.
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>