mac80211: use spin_lock_bh() for tim_lock
There's no need to use _irqsave() as the lock
is never used in interrupt context.
This also fixes a problem in the iwlwifi MVM
driver that calls spin_unlock_bh() within its
set_tim() callback.
Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
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