wifi: mac80211: fix another key installation error path

Due to overlapping changes and merges, another error
path ended up broken. Fix this one as well.
Reported-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/key.c

@@ -881,8 +881,10 @@ int ieee80211_key_link(struct ieee80211_key *key,
 		if (link_id >= 0) {
 			link_sta = rcu_dereference_protected(sta->link[link_id],
 							     lockdep_is_held(&sta->local->hw.wiphy->mtx));
-			if (!link_sta)
-				return -ENOLINK;
+			if (!link_sta) {
+				ret = -ENOLINK;
+				goto out;
+			}
 		}
 
 		old_key = wiphy_dereference(sdata->local->hw.wiphy,