parisc: led: Use for_each_netdev_rcu()

	rx_total = tx_total = 0;

	/* we are running as a workqueue task, so locking dev_base 

	 * for reading should be OK */

	read_lock(&dev_base_lock);

	/* we are running as a workqueue task, so we can use an RCU lookup */

	rcu_read_lock();

	for_each_netdev(&init_net, dev) {

	for_each_netdev_rcu(&init_net, dev) {

	    const struct net_device_stats *stats;

	    struct in_device *in_dev = __in_dev_get_rcu(dev);

	    if (!in_dev || !in_dev->ifa_list)

	    tx_total += stats->tx_packets;

	}

	rcu_read_unlock();

	read_unlock(&dev_base_lock);

	retval = 0;