Fixes the following sparse warning:
drivers/net/wireless/marvell/libertas/cfg.c:2047:5: warning:
 symbol 'lbs_set_power_mgmt' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
 
 
 
-int lbs_set_power_mgmt(struct wiphy *wiphy, struct net_device *dev,
-                      bool enabled, int timeout)
+static int lbs_set_power_mgmt(struct wiphy *wiphy, struct net_device *dev,
+                             bool enabled, int timeout)
 {
        struct lbs_private *priv = wiphy_priv(wiphy);