[Bug 192487] cpucontrol uses unsafe procedure to detect current microcode version

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192487

--- Comment #9 from commit-hook at freebsd.org ---
A commit references this bug:

Author: emaste
Date: Sat May 12 15:34:35 UTC 2018
New revision: 333569
URL: https://svnweb.freebsd.org/changeset/base/333569

Log:
  cpucontrol: improve Intel microcode revision check

  According to the Intel SDM (Volme 3, 9.11.7) the BIOS signature MSR
  should be zeroed before executing cpuid (although in practice it does
  not seem to matter).

  PR:           192487
  Submitted by: Dan Lukes
  Reported by:  Henrique de Moraes Holschuh
  MFC after:    3 days

Changes:
  head/usr.sbin/cpucontrol/intel.c

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