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MFC r307966:

Description

MFC r307966:

Remove an extraneous call to soisconnected() in syncache_socket(),
introduced with r261242. The useful and expected soisconnected()
call is done in tcp_do_segment().

Has been found as part of unrelated PR:212920 investigation.

Improve slightly (~2%) the maximum number of TCP accept per second.

Tested by: kevin.bowling_kev009.com, jch
Approved by: gnn, hiren
MFC after: 1 week
Sponsored by: Verisign, Inc
Differential Revision: https://reviews.freebsd.org/D8072