Make sure tcp_mss() has the same check as tcp_mss_update() to have t_maxseg set
to at least 64.

This is still just a coverup to avoid kernel panic and not an actual fix.

PR: 213232
Reviewed by: glebius
MFC after: 1 week
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D8272