mac80211: report operating frequency rather than current

It's not very helpful to see, in iwconfig, the current frequency
the card is tuned to if that frequency is currently somewhere
across the board because we're scanning. Since we keep track of
the frequency the user wants, display that instead.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/wext.c

@@ -185,7 +185,7 @@ static int ieee80211_ioctl_giwfreq(struct net_device *dev,
 	if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 		return cfg80211_ibss_wext_giwfreq(dev, info, freq, extra);
 
-	freq->m = local->hw.conf.channel->center_freq;
+	freq->m = local->oper_channel->center_freq;
 	freq->e = 6;
 
 	return 0;