Andriy Voskoboinyk 7071b803da net80211: fix panic when device is removed during initialization
if_dead() is called during device detach - check if interface is
still exists before trying to refresh vap MAC address
(IF_LLADDR will trigger page fault otherwise).

MFC after:	5 days
2019-01-09 12:50:24 +00:00
..
2019-01-03 22:49:11 +00:00
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