[Bug 228982] [panic] page fault in mld_v2_cancel_link_timers() on boot

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228982

--- Comment #3 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ae
Date: Thu Jun 14 09:36:25 UTC 2018
New revision: 335129
URL: https://svnweb.freebsd.org/changeset/base/335129

Log:
  Add NULL check like the rest of code has.

  It is possible that ifma_protospec becomes NULL in this function for
  some entry, but it is still referenced and thus it will not unlinked
  from the list. Then "restart" condition triggers and this entry with
  NULL ifma_protospec will lead to page fault.

  PR:           228982

Changes:
  head/sys/netinet6/mld6.c

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