wifi: mac80211: remove unnecessary synchronize_net()

The call to ieee80211_do_stop() right after will also do
synchronize_rcu() to ensure the SDATA_STATE_RUNNING bit
is cleared, so we don't need to synchronize_net() here.

Change-Id: Id9f9ffcf195002013e5d9fde288877d219780864
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/iface.c

@@ -1849,8 +1849,7 @@ static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
 
 	ieee80211_stop_vif_queues(local, sdata,
 				  IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
-	synchronize_net();
-
+	/* do_stop will synchronize_rcu() first thing */
 	ieee80211_do_stop(sdata, false);
 
 	ieee80211_teardown_sdata(sdata);