ethernet: seeq/ether3: don't write directly to netdev->dev_addr

netdev->dev_addr is const now.

Compile tested rpc_defconfig w/ GCC 8.5.

Fixes: adeef3e3 ("net: constify netdev->dev_addr")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/seeq/ether3.c

@@ -749,6 +749,7 @@ ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 	const struct ether3_data *data = id->data;
 	struct net_device *dev;
 	int bus_type, ret;
+	u8 addr[ETH_ALEN];
 
 	ether3_banner();
 
@@ -776,7 +777,8 @@ ether3_probe(struct expansion_card *ec, const struct ecard_id *id)
 	priv(dev)->seeq = priv(dev)->base + data->base_offset;
 	dev->irq = ec->irq;
 
-	ether3_addr(dev->dev_addr, ec);
+	ether3_addr(addr, ec);
+	eth_hw_addr_set(dev, addr);
 
 	priv(dev)->dev = dev;
 	timer_setup(&priv(dev)->timer, ether3_ledoff, 0);