wlandebug(8): use new IEEE80211_IOC_UNIT ioctl request

[avos]

Summary

Try to get original interface unit number even when interface name was changed; use old method in case if something fails during request.

[adrian]

usr.sbin/wlandebug/wlandebug.c

171

hm, should we put this in lib80211?

[avos]

usr.sbin/wlandebug/wlandebug.c

171

interface name -> unit translation?

[adrian]

maybe the libifconfig thing that was done recently?

-a

[avos]

nope; however, libifconfig seems to be more appropriate for such things (so there are alternative versions in D12554 (libifconfig) and D12555 (wlandebug)).

[avos]

Version which uses libifconfig was accepted / committed instead.