ethernet: stmmac: 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/stmicro/stmmac/stmmac_main.c

@@ -2818,9 +2818,13 @@ static int stmmac_get_hw_features(struct stmmac_priv *priv)
  */
 static void stmmac_check_ether_addr(struct stmmac_priv *priv)
 {
+	u8 addr[ETH_ALEN];
+
 	if (!is_valid_ether_addr(priv->dev->dev_addr)) {
-		stmmac_get_umac_addr(priv, priv->hw, priv->dev->dev_addr, 0);
-		if (!is_valid_ether_addr(priv->dev->dev_addr))
+		stmmac_get_umac_addr(priv, priv->hw, addr, 0);
+		if (is_valid_ether_addr(addr))
+			eth_hw_addr_set(priv->dev, addr);
+		else
 			eth_hw_addr_random(priv->dev);
 		dev_info(priv->device, "device MAC address %pM\n",
 			 priv->dev->dev_addr);