mac80211: clean up key freeing a bit

When a key is allocated but not really added, there's no
need to go through the entire teardown process. Also, if
adding a key fails, ieee80211_key_link() can take care of
freeing it instead of the (only) caller.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 61fc911..c2d4bf2 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -175,7 +175,7 @@
 		 *       add it to the device after the station.
 		 */
 		if (!sta || !test_sta_flag(sta, WLAN_STA_ASSOC)) {
-			ieee80211_key_free(sdata->local, key);
+			ieee80211_key_free_unused(key);
 			err = -ENOENT;
 			goto out_unlock;
 		}
@@ -214,8 +214,6 @@
 	}
 
 	err = ieee80211_key_link(key, sdata, sta);
-	if (err)
-		ieee80211_key_free(sdata->local, key);
 
  out_unlock:
 	mutex_unlock(&sdata->local->sta_mtx);