mac80211: fix rx flow sparse errors, make functions static

This patch adds static declarations to functions in the Rx flow in order to
eliminate sparse errors

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index e7da1cd..2019b4f 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -1154,8 +1154,8 @@
 	sta_info_put(sta);
 }
 
-void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
-				u16 initiator, u16 reason_code)
+static void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
+				 u16 initiator, u16 reason_code)
 {
 	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);