BUG/MINOR: tcp: don't try to set defaultmss when value is negative

when `getsockopt` previously failed, we were trying to set defaultmss
with -2 value.

this is a followup of github issue #499

this should be backported to all versions >= v1.8

Fixes: 153659f1ae69a1 ("MINOR: tcp: When binding socket, attempt to
reuse one from the old proc.")
Signed-off-by: William Dauchy <w.dauchy@criteo.com>
(cherry picked from commit 97a7bdac3e9e64e9f128943ee3d7b48de88a7daf)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit 7fc2d0efbbd443206441f8a766b4b61123ac3724)
Signed-off-by: Willy Tarreau <w@1wt.eu>
1 file changed