[Bug 241253] if_rtwn_usb module leaves device loaded on system shutdown

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241253

            Bug ID: 241253
           Summary: if_rtwn_usb module leaves device loaded on system
                    shutdown
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: wireless at FreeBSD.org
          Reporter: rocky at herveybayaustralia.com.au

TP Link wn823n usb wifi adaptor will only work on removal/reinsertion of
adaptor. Testing shows that on reboot the adaptor is left in an undesirable
state and once system is initialised no longer works.
Cold boot the device will still work.
The only way to keep the device operational across reboot (warm boot) is to
stop devd/devfs and kldunload the module (currently using
/etc/rc.shutdown.local).

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