mac80211: let sta_info_get_by_idx get sta by sdata

Instead of filtering by device, directly look up by sdata.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
index 396a948..aa017a5 100644
--- a/net/mac80211/sta_info.c
+++ b/net/mac80211/sta_info.c
@@ -116,14 +116,15 @@
 	return sta;
 }
 
-struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
-				     struct net_device *dev)
+struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
+				     int idx)
 {
+	struct ieee80211_local *local = sdata->local;
 	struct sta_info *sta;
 	int i = 0;
 
 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
-		if (dev && dev != sta->sdata->dev)
+		if (sdata != sta->sdata)
 			continue;
 		if (i < idx) {
 			++i;