tcp:Make TCP_MAXSEG minimum more correct
committ c39508d upstream.

Use TCP_MIN_MSS instead of constant 64.(B4 was 8)

Reported-by: Min Zhang <mzhang@mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: Moritz Muehlenhoff <jmm@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>