net/sched: act_tunnel_key: Allow key-less tunnels
Allow setting a tunnel without a tunnel key. This is required for tunneling protocols, such as GRE, that define the key as an optional field. Signed-off-by: NAdi Nissim <adin@mellanox.com> Acked-by: NOr Gerlitz <ogerlitz@mellanox.com> Reviewed-by: NOz Shlomo <ozsh@mellanox.com> Acked-by: NJiri Pirko <jiri@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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