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H A Dtcp_output.cdiff 8c2320e84c193d4d42b8446986afa2797fb411e1 Mon Apr 23 23:46:25 CEST 2018 Eric Dumazet <edumazet@google.com> tcp: md5: only call tp->af_specific->md5_lookup() for md5 sockets

RETPOLINE made calls to tp->af_specific->md5_lookup() quite expensive,
given they have no result.
We can omit the calls for sockets that have no md5 keys.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>