mac80211: use oper_channel in rate init

Using hw.conf.channel is wrong as it could be the
temporary channel if the station is added from the
workqueue while the device is already on another
channel. Use oper_channel instead.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/rate.h

@@ -56,7 +56,7 @@ static inline void rate_control_rate_init(struct sta_info *sta)
 	if (!ref)
 		return;
 
-	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
+	sband = local->hw.wiphy->bands[local->oper_channel->band];
 
 	ref->ops->rate_init(ref->priv, sband, ista, priv_sta);
 	set_sta_flag(sta, WLAN_STA_RATE_CONTROL);