net: ethernet: improve eth_platform_get_mac_address

pci_device_to_OF_node(to_pci_dev(dev)) is the same as dev->of_node,
so we can simplify the code. In addition add an empty line before
the return statement.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ethernet/eth.c

@@ -549,17 +549,10 @@ unsigned char * __weak arch_get_platform_mac_address(void)
 
 int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
 {
-	const unsigned char *addr;
-	struct device_node *dp;
+	const unsigned char *addr = NULL;
 
-	if (dev_is_pci(dev))
-		dp = pci_device_to_OF_node(to_pci_dev(dev));
-	else
-		dp = dev->of_node;
-
-	addr = NULL;
-	if (dp)
-		addr = of_get_mac_address(dp);
+	if (dev->of_node)
+		addr = of_get_mac_address(dev->of_node);
 	if (IS_ERR_OR_NULL(addr))
 		addr = arch_get_platform_mac_address();
 
@@ -567,6 +560,7 @@ int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
 		return -ENODEV;
 
 	ether_addr_copy(mac_addr, addr);
+
 	return 0;
 }
 EXPORT_SYMBOL(eth_platform_get_mac_address);