neigh: Don't require a dst in neigh_resolve_output
Having a dst helps a little bit for teql but is fundamentally unnecessary and there are code paths where a dst is not available that it would be nice to use the neighbour cache. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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