more net80211 changes :/

[Andriy Voskoboinyk]

>> The current patch covers iwn(4) only. Now sending this mail with patched
>> driver. Changing MAC aldo tested - works.
>>
>> I'm starting to convert rest of drivers and meanwhile, waiting for your
>> input. May be you have ideas what else can be improved here.
>>
>
> Do not forget to free iv_softc - it's allocated separately.

struct ieee80211_beacon_offsets can be moved to the ieee80211_vap too.