[Bug 205194] Changing MTU higher than 1500 on the interface pfsync0 causes panic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205194

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kp
Date: Mon Dec 14 19:44:49 UTC 2015
New revision: 292219
URL: https://svnweb.freebsd.org/changeset/base/292219

Log:
  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

Changes:
  head/sys/netinet6/in6.c
  head/sys/netinet6/nd6.c

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