nl80211: Fix potential memory leak in nl80211_set_wowlan

Compared to cfg80211_rdev_free_wowlan in core.h,
the error goto label lacks the freeing of nd_config.
Fix that.
Signed-off-by: Ola Olsson <ola.olsson@sonymobile.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/wireless/nl80211.c

@@ -9503,6 +9503,7 @@ static int nl80211_set_wowlan(struct sk_buff *skb, struct genl_info *info)
 	if (new_triggers.tcp && new_triggers.tcp->sock)
 		sock_release(new_triggers.tcp->sock);
 	kfree(new_triggers.tcp);
+	kfree(new_triggers.nd_config);
 	return err;
 }
 #endif