[Bug 211885] if_iwm firmware crashes and recovers

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211885

            Bug ID: 211885
           Summary: if_iwm firmware crashes and recovers
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Keywords: crash
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: rene at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 173718
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=173718&action=edit
iwm firmware panic messages

if_iwm crashes firmware randomly(?) crashes with my iwm3165 card (which if_iwm
indeed shows as an iwm3165 but is handled by iwm7265fw.ko)

The firmware successfully restarts after these crashes, I'm typing this PR with
a restarted firmware. It also seems to crash after a few days of uptime
(typically 2+ days).

dmesg samples attached.

uname -a:
FreeBSD e17 12.0-CURRENT FreeBSD 12.0-CURRENT #7 r303697: Wed Aug  3 10:41:19
CEST 2016     rene at e17:/usr/obj/usr/home/rene/freebsd/src/head/sys/GENERIC 
amd64

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