rtl8xxxu: Unregister from mac80211 before shutting down the device

This fixes a long standing bug where mac80211 would send disconnect
packets to the device, after we had shut down the device.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
1 file changed