mac80211: clear local->ps_data on disassoc

local->ps_data wasn't cleared on disassociation, which
(in some corner cases) caused reconnections to enter
psm before association completed.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/mlme.c

@@ -1095,6 +1095,7 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
 		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
 		config_changed |= IEEE80211_CONF_CHANGE_PS;
 	}
+	local->ps_sdata = NULL;
 
 	ieee80211_hw_config(local, config_changed);