wlcore: fix sparse warnings related to static functions

The "static" modifier was mistakenly forgotten for some functions.
Signed-off-by: NArik Nemtsov <arik@wizery.com>
Signed-off-by: NLuciano Coelho <coelho@ti.com>

drivers/net/wireless/ti/wl18xx/main.c

@@ -1098,7 +1098,7 @@ static struct ieee80211_sta_ht_cap wl18xx_mimo_ht_cap = {
 		},
 };
 
-int __devinit wl18xx_probe(struct platform_device *pdev)
+static int __devinit wl18xx_probe(struct platform_device *pdev)
 {
 	struct wl1271 *wl;
 	struct ieee80211_hw *hw;