patch "staging: rtl8723au: os_dep: declared cfg80211_infrastructure_mode static

Declared cfg80211_infrastructure_mode method static to remove sparse warning
Signed-off-by: NRahul Garg <rahul.lnmiit@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723au/os_dep/ioctl_cfg80211.c

@@ -1118,7 +1118,7 @@ static int cfg80211_rtw_get_station(struct wiphy *wiphy,
 	return ret;
 }
 
-int cfg80211_infrastructure_mode(struct rtw_adapter *padapter,
+static int cfg80211_infrastructure_mode(struct rtw_adapter *padapter,
 				 enum nl80211_iftype ifmode)
 {
 	struct mlme_priv *pmlmepriv = &padapter->mlmepriv;