net: ethernet: emac: utilize of_net's of_get_mac_address()

of_get_mac_address() reads the same "local-mac-address" property.
... But goes above and beyond by checking the MAC value properly.

printk+message seems outdated too,
so let's put dev_err in the queue.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ibm/emac/core.c

@@ -2848,7 +2848,6 @@ static int emac_init_phy(struct emac_instance *dev)
 static int emac_init_config(struct emac_instance *dev)
 {
 	struct device_node *np = dev->ofdev->dev.of_node;
-	const void *p;
 	int err;
 
 	/* Read config from device-tree */
@@ -2976,13 +2975,12 @@ static int emac_init_config(struct emac_instance *dev)
 	}
 
 	/* Read MAC-address */
-	p = of_get_property(np, "local-mac-address", NULL);
-	if (p == NULL) {
-		printk(KERN_ERR "%pOF: Can't find local-mac-address property\n",
-		       np);
-		return -ENXIO;
+	err = of_get_mac_address(np, dev->ndev->dev_addr);
+	if (err) {
+		if (err != -EPROBE_DEFER)
+			dev_err(&dev->ofdev->dev, "Can't get valid [local-]mac-address from OF !\n");
+		return err;
 	}
-	memcpy(dev->ndev->dev_addr, p, ETH_ALEN);
 
 	/* IAHT and GAHT filter parameterization */
 	if (emac_has_feature(dev, EMAC_FTR_EMAC4SYNC)) {