[Bug 221957] cam iosched: Add a handler for the quanta sysctl to enforce valid values

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221957

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

Author: imp
Date: Wed Sep 20 21:19:54 UTC 2017
New revision: 323829
URL: https://svnweb.freebsd.org/changeset/base/323829

Log:
  cam iosched: Add a handler for the quanta sysctl to enforce valid values

  Invalid values can result in devision-by-zero panics or other
  undefined behaviour so lets not allow them.

  PR: 221957
  Obtained from: ElectroBSD
  Submitted by: Fabian Keil
  Differential Revision: https://reviews.freebsd.org/D12351

Changes:
  head/sys/cam/cam_iosched.c

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