mac80211: make wake/stop_queue_by_reason() functions static

Fixes sparse warnings:

net/mac80211/util.c:355:6: warning: symbol
  'ieee80211_wake_queue_by_reason' was not declared. Should it be static?
net/mac80211/util.c:385:6: warning: symbol
  'ieee80211_stop_queue_by_reason' was not declared. Should it be static?

Thanks to Johannes Berg for reporting this.
Signed-off-by: Kalle Valo <kalle.valo@iki.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/util.c

@@ -352,8 +352,8 @@ static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
 	}
 }
 
-void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
-				    enum queue_stop_reason reason)
+static void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
+					   enum queue_stop_reason reason)
 {
 	struct ieee80211_local *local = hw_to_local(hw);
 	unsigned long flags;
@@ -382,8 +382,8 @@ static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
 	netif_stop_subqueue(local->mdev, queue);
 }
 
-void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
-				    enum queue_stop_reason reason)
+static void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
+					   enum queue_stop_reason reason)
 {
 	struct ieee80211_local *local = hw_to_local(hw);
 	unsigned long flags;