FEC: Fix kernel panic in fec_set_mac_address.

Fix memory corruption that sometimes result in kernel panic.
Signed-off-by: NMattias Walström <mattias@vmlinux.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/fec.c

@@ -1653,7 +1653,7 @@ fec_set_mac_address(struct net_device *dev, void *p)
 		(dev->dev_addr[1] << 16) | (dev->dev_addr[0] << 24),
 		fep->hwp + FEC_ADDR_LOW);
 	writel((dev->dev_addr[5] << 16) | (dev->dev_addr[4] << 24),
-		fep + FEC_ADDR_HIGH);
+		fep->hwp + FEC_ADDR_HIGH);
 	return 0;
 }