cfg80211: export cfg80211_wext_siwfreq

cfg80211_wext_siwfreq() should be exported with EXPORT_SYMBOL_GPL.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wireless/wext-compat.c

@@ -771,6 +771,7 @@ int cfg80211_wext_siwfreq(struct net_device *dev,
 		return err;
 	}
 }
+EXPORT_SYMBOL_GPL(cfg80211_wext_siwfreq);
 
 int cfg80211_wext_giwfreq(struct net_device *dev,
 			  struct iw_request_info *info,