[Bug 222681] ifconfig txpower has no effect if set on a DOWN interface

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222681

            Bug ID: 222681
           Summary: ifconfig txpower has no effect if set on a DOWN
                    interface
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: valentin.vergez at stormshield.eu

Changing txpower on a wlan interface which is DOWN and then setting the
interface UP has no effect on true output power.

ifconfig <interface> correctly displays the set txpower

It works perfectly if txpower is set when interface is UP.

Step to reproduce:
ifconfig wlan0 up
ifconfig wlan0 txpower 20
ifconfig wlan0 down
ifconfig wlan0 txpower 1
ifconfig wlan0 up
# Ifconfig now displays "txpower 1" but output power is still up to 20dBm

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