wifi: mac80211: fix TXQ error path and cleanup

We currently call ieee80211_txq_teardown_flows() as part
of ieee80211_remove_interfaces(), but that's not really
right in case of HW registration failures, specifically
rate control. Call it separately to fix that issue.
Reported-by: Zhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/iface.c

@@ -2255,8 +2255,6 @@ void ieee80211_remove_interfaces(struct ieee80211_local *local)
 	WARN(local->open_count, "%s: open count remains %d\n",
 	     wiphy_name(local->hw.wiphy), local->open_count);
 
-	ieee80211_txq_teardown_flows(local);
-
 	mutex_lock(&local->iflist_mtx);
 	list_splice_init(&local->interfaces, &unreg_list);
 	mutex_unlock(&local->iflist_mtx);

net/mac80211/main.c

@@ -1457,6 +1457,7 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 	ieee80211_remove_interfaces(local);
 	rtnl_unlock();
  fail_rate:
+	ieee80211_txq_teardown_flows(local);
  fail_flows:
 	ieee80211_led_exit(local);
 	destroy_workqueue(local->workqueue);
@@ -1493,6 +1494,8 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 	 */
 	ieee80211_remove_interfaces(local);
 
+	ieee80211_txq_teardown_flows(local);
+
 	wiphy_lock(local->hw.wiphy);
 	wiphy_delayed_work_cancel(local->hw.wiphy, &local->roc_work);
 	wiphy_work_cancel(local->hw.wiphy, &local->reconfig_filter);