sit: use the right netns in ioctl handler
Because the netdevice may be in another netns than the i/o netns, we should use the i/o netns instead of dev_net(dev). Note that netdev_priv(dev) cannot bu NULL, hence we can remove these useless checks. Signed-off-by: NNicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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