mac80211: fix sdata locking around __ieee80211_request_smps
My cfg80211/mac80211 locking unification broke the sdata locking in ieee80211_set_power_mgmt, it needs to acquire the lock for __ieee80211_request_smps(). Add the locking. Reported-by: NJakub Kicinski <kubakici@wp.pl> Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
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