The recent patch that tied enabling of veth NAPI to the GRO flag also has
the nice side effect that a veth device can be the target of an
XDP_REDIRECT without an XDP program needing to be loaded on the peer
device. However, the patch adding this extra NAPI mode didn't actually
change the check in veth_xdp_xmit() to also look at the new NAPI pointer,
so let's fix that.

Fixes: 6788fa154546 ("veth: allow enabling NAPI even without XDP")
Signed-off-by: NToke Høiland-Jørgensen <toke@redhat.com>
Acked-by: NJesper Dangaard Brouer <brouer@redhat.com>
Acked-by: NPaolo Abeni <pabeni@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>