cfg80211: remove unused wiphy argument from cfg80211_wext_freq()

cfg80211_wext_freq() is declared in wext-compat.h, but its
parameter struct wiphy's declaration is not included there.
As the parameter isn't used, just remove it.

Signed-off-by: Zhao, Gang <gamerh2o@gmail.com>
[remove parameter instead of changing to netdev]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/wireless/wext-compat.h b/net/wireless/wext-compat.h
index 5d766b0..ebcacca 100644
--- a/net/wireless/wext-compat.h
+++ b/net/wireless/wext-compat.h
@@ -50,7 +50,7 @@
 			   struct iw_point *data, char *extra);
 
 
-int cfg80211_wext_freq(struct wiphy *wiphy, struct iw_freq *freq);
+int cfg80211_wext_freq(struct iw_freq *freq);
 
 
 extern const struct iw_handler_def cfg80211_wext_handler;