b43legacy: Fix sparse warning

Fix a sparse warning about a nonstatic function.
Signed-off-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/b43legacy/main.c

@@ -3335,7 +3335,7 @@ static int b43legacy_start(struct ieee80211_hw *hw)
 	return err;
 }
 
-void b43legacy_stop(struct ieee80211_hw *hw)
+static void b43legacy_stop(struct ieee80211_hw *hw)
 {
 	struct b43legacy_wl *wl = hw_to_b43legacy_wl(hw);
 	struct b43legacy_wldev *dev = wl->current_dev;