net: bridge: use new function dev_fetch_sw_netstats

			   struct rtnl_link_stats64 *stats)

{

	struct net_bridge *br = netdev_priv(dev);

	struct pcpu_sw_netstats tmp, sum = { 0 };

	unsigned int cpu;

	for_each_possible_cpu(cpu) {

		unsigned int start;

		const struct pcpu_sw_netstats *bstats

			= per_cpu_ptr(br->stats, cpu);

		do {

			start = u64_stats_fetch_begin_irq(&bstats->syncp);

			memcpy(&tmp, bstats, sizeof(tmp));

		} while (u64_stats_fetch_retry_irq(&bstats->syncp, start));

		sum.tx_bytes   += tmp.tx_bytes;

		sum.tx_packets += tmp.tx_packets;

		sum.rx_bytes   += tmp.rx_bytes;

		sum.rx_packets += tmp.rx_packets;

	}

	stats->tx_bytes   = sum.tx_bytes;

	stats->tx_packets = sum.tx_packets;

	stats->rx_bytes   = sum.rx_bytes;

	stats->rx_packets = sum.rx_packets;

	dev_fetch_sw_netstats(stats, br->stats);

}

static int br_change_mtu(struct net_device *dev, int new_mtu)