[Bug 235097] ci runs panic with use-after-free when running sys/netpfil/pf/nat tests

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235097

--- Comment #13 from commit-hook at freebsd.org ---
A commit references this bug:

Author: kp
Date: Fri Jan 25 01:06:06 UTC 2019
New revision: 343418
URL: https://svnweb.freebsd.org/changeset/base/343418

Log:
  pf: Fix use-after-free of counters

  When cleaning up a vnet we free the counters in V_pf_default_rule and
  V_pf_status from shutdown_pf(), but we can still use them later, for example
  through pf_purge_expired_src_nodes().

  Free them as the very last operation, as they rely on nothing else
themselves.

  PR:           235097
  MFC after:    1 week

Changes:
  head/sys/netpfil/pf/pf_ioctl.c

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