K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2015-12-14T19:44:49.071994Z
K 7
svn:log
V 414
inet6: Do not assume every interface has ip6 enabled.

Certain interfaces (e.g. pfsync0) do not have ip6 addresses (in other words,
ifp->if_afdata[AF_INET6] is NULL). Ensure we don't panic when the MTU is
updated.

pfsync interfaces will never have ip6 support, because it's explicitly disabled
in in6_domifattach().

PR:		205194
Reviewed by:	melifaro, hrs
Differential Revision:	https://reviews.freebsd.org/D4522

END