Staging: wlan-ng: Fix sparse non-static symbol warning

Fix sparse non-static symbol warning in wlan-ng driver.
Signed-off-by: Tugce Sirin <ztugcesirin@gmail.com>
Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>

drivers/staging/wlan-ng/cfg80211.c

@@ -749,7 +749,7 @@ static const struct cfg80211_ops prism2_usb_cfg_ops = {
 
 
 /* Functions to create/free wiphy interface */
-struct wiphy *wlan_create_wiphy(struct device *dev, wlandevice_t *wlandev)
+static struct wiphy *wlan_create_wiphy(struct device *dev, wlandevice_t *wlandev)
 {
 	struct wiphy *wiphy;
 	struct prism2_wiphy_private *priv;
@@ -786,7 +786,7 @@ struct wiphy *wlan_create_wiphy(struct device *dev, wlandevice_t *wlandev)
 }
 
 
-void wlan_free_wiphy(struct wiphy *wiphy)
+static void wlan_free_wiphy(struct wiphy *wiphy)
 {
 	wiphy_unregister(wiphy);
 	wiphy_free(wiphy);