mac80211: mesh hwmp locking fixes

This fixes missing unlocks noticed by sparse.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/mesh_hwmp.c

@@ -264,8 +264,10 @@ static u32 hwmp_route_info_get(struct net_device *dev,
 
 	rcu_read_lock();
 	sta = sta_info_get(local, mgmt->sa);
-	if (!sta)
+	if (!sta) {
+		rcu_read_unlock();
 		return 0;
+	}
 
 	last_hop_metric = airtime_link_metric_get(local, sta);
 	/* Update and check originator routing info */
@@ -293,6 +295,7 @@ static u32 hwmp_route_info_get(struct net_device *dev,
 		break;
 	default:
 		sta_info_put(sta);
+		rcu_read_unlock();
 		return 0;
 	}
 	new_metric = orig_metric + last_hop_metric;