xtables: ipv6: fix wrong error if -p is used

shell$ xtables -6 -I INPUT -p tcp --dport 22 -j ACCEPT
xtables v1.4.15: -f is not valid on IPv6
Try `xtables -h' or 'xtables --help' for more information.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1 file changed