ethernet: r8169: use eth_hw_addr_set()

Commit 406f42fa ("net-next: When a bond have a massive amount
of VLANs...") introduced a rbtree for faster Ethernet address look
up. To maintain netdev->dev_addr in this tree we need to make all
the writes to it got through appropriate helpers.

Read the address into an array on the stack, then call
eth_hw_addr_set().
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169_main.c

@@ -5217,7 +5217,7 @@ static int rtl_get_ether_clk(struct rtl8169_private *tp)
 static void rtl_init_mac_address(struct rtl8169_private *tp)
 {
 	struct net_device *dev = tp->dev;
-	u8 *mac_addr = dev->dev_addr;
+	u8 mac_addr[ETH_ALEN];
 	int rc;
 
 	rc = eth_platform_get_mac_address(tp_to_dev(tp), mac_addr);
@@ -5235,6 +5235,7 @@ static void rtl_init_mac_address(struct rtl8169_private *tp)
 	eth_hw_addr_random(dev);
 	dev_warn(tp_to_dev(tp), "can't read MAC address, setting random one\n");
 done:
+	eth_hw_addr_set(dev, mac_addr);
 	rtl_rar_set(tp, mac_addr);
 }