net: plumb extack in __dev_change_net_namespace()
It could be hard to understand why the netlink command fails. For example, if dev->netns_immutable is set, the error is "Invalid argument". Signed-off-by:Nicolas Dichtel <nicolas.dichtel@6wind.com> Reviewed-by:
Eric Dumazet <edumazet@google.com> Reviewed-by:
Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by:
Paolo Abeni <pabeni@redhat.com>
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