net: xilinx_emacps: Fixed accessing NULL pointer error when local-mac…

…-address is not available in device tree

drivers/net/ethernet/xilinx/xilinx_emacps.c

@@ -2919,6 +2919,7 @@ static int __devinit xemacps_probe(struct platform_device *pdev)
 	u32 regval = 0;
 	int rc = -ENXIO;
 	int size = 0;
+	const u8* addr;
 
 	r_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	r_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
@@ -3065,10 +3066,11 @@ static int __devinit xemacps_probe(struct platform_device *pdev)
 		goto err_out_unregister_clk_notifier;
 	}
 
-	lp->ndev->dev_addr = of_get_property(lp->pdev->dev.of_node, "local-mac-address", &size);
-	if ((!lp->ndev->dev_addr) || (size != 6)) {
+	addr = of_get_property(lp->pdev->dev.of_node, "local-mac-address", &size);
+	if ((!addr) || (size != 6)) {
 		dev_warn(&lp->pdev->dev, "Could not find MAC address in device tree, use default\n");
 	} else {
+		memcpy(lp->ndev->dev_addr, addr, sizeof(addr));
 		xemacps_set_hwaddr(lp);
 	}
 	xemacps_update_hwaddr(lp);