urtwn regression(?) from 10.2 to current r291431

[Anton Shterenlikht]

I posted this about a week ago:

http://lists.freebsd.org/pipermail/freebsd-current/2015-November/058683.html

The problem is that urtwn stopped
working in current r291431.

I did more testing with the same revision,
and sometimes it would work, but extremely
slowly, and sometimes seemingly associate
but get an address of 0.0.0.0.

I now installed 10.2-RELEASE-p8 and
the urtwn works fine, no issues at all.

Does this look like a bug at some recent
current revision? Should I file a PR?

I's just I recall there have been major
chages to wlan, so perphaps I'm forgetting
to change the config in recent current?

Please advise

Anton