git: ipfw: Raise WARNS to 6

[Sepherosa Ziehau]

commit 75a579b7d9274307c532a754bba4279ebd641b9a
Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
Date:   Wed Sep 13 09:41:43 2017 +0800

    ipfw: Raise WARNS to 6

Summary of changes:
 sbin/ipfw/Makefile |   2 +-
 sbin/ipfw/ipfw2.c  | 174 ++++++++++++++++++++++++++---------------------------
 2 files changed, 87 insertions(+), 89 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/75a579b7d9274307c532a754bba4279ebd641b9a


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