net/sched: act_tunnel_key: disambiguate metadata dst error cases
Metadata may be NULL for one of two reasons: * Missing user input * Failure to allocate the metadata dst Disambiguate these case by returning -EINVAL for the former and -ENOMEM for the latter rather than -EINVAL for both cases. This is in preparation for using extended ack to provide more information to users when parsing their input. Signed-off-by: NSimon Horman <simon.horman@netronome.com> Reviewed-by: NJakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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