Andriy Voskoboinyk 810490a0e2 net80211: do not allow to unload rate control module if it is still in use.
Keep 'nrefs' counter up-to-date, so 'kldunload wlan_amrr' with 1+ active
wlan(4) interface will not lead to kernel panic.

MFC after:	5 days
2017-07-23 22:38:00 +00:00
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