[Bug 208933] [regression] "ifconfig wlan0 ether ..." broken after r297592

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208933

            Bug ID: 208933
           Summary: [regression] "ifconfig wlan0 ether ..." broken after
                    r297592
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Keywords: regression
          Severity: Affects Some People
          Priority: ---
         Component: wireless
          Assignee: freebsd-wireless at FreeBSD.org
          Reporter: fk at fabiankeil.de
                CC: avos at freebsd.org
          Keywords: regression

After r297592, wpa_supplicant can no longer associate to an AP
if wlan0's MAC address has been changed with "ifconfig wlan0 ether ...":

wpa_supplicant[76190]: wlan0: Trying to associate with [...] (SSID='[...]'
freq=2447 MHz)
wpa_supplicant[76190]: wlan0: Authentication with [...] timed out.
wpa_supplicant[76190]: wlan0: CTRL-EVENT-DISCONNECTED bssid=[...]reason=3
locally_generated=1

After destroying the device and recreating it without changing the
MAC address afterwards, wpa_supplicant can associate with the AP again.

In my case the wlandev is iwn0, but looking at r297592 I suspect that
this is not a device-specific issue.

Reverting r297592 works around the problem.

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