drivers: net: davinci_mdio: fix return value check in davinci_mdio_probe()

In case of error, the function devm_ioremap() returns NULL pointer not
ERR_PTR(). The IS_ERR() test in the return value check should be
replaced with NULL test.

Fixes: 03f66f06 ("net: ethernet: ti: davinci_mdio: use devm_ioremap()")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/ti/davinci_mdio.c

@@ -398,8 +398,8 @@ static int davinci_mdio_probe(struct platform_device *pdev)
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	data->regs = devm_ioremap(dev, res->start, resource_size(res));
-	if (IS_ERR(data->regs))
-		return PTR_ERR(data->regs);
+	if (!data->regs)
+		return -ENOMEM;
 
 	davinci_mdio_init_clk(data);