[PATCH net-next] net: dsa: gswip: Fix return value check in gswip_probe()

[Wei Yongjun]

In case of error, the function devm_ioremap_resource() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should
be replaced with IS_ERR().

Fixes: 14fceff4771e ("net: dsa: Add Lantiq / Intel DSA driver for vrx200")
Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
---
 drivers/net/dsa/lantiq_gswip.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index 9c28d0b..faac359 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -1044,18 +1044,18 @@ static int gswip_probe(struct platform_device *pdev)
 
        gswip_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        priv->gswip = devm_ioremap_resource(dev, gswip_res);
-       if (!priv->gswip)
-               return -ENOMEM;
+       if (IS_ERR(priv->gswip))
+               return PTR_ERR(priv->gswip);
 
        mdio_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
        priv->mdio = devm_ioremap_resource(dev, mdio_res);
-       if (!priv->mdio)
-               return -ENOMEM;
+       if (IS_ERR(priv->mdio))
+               return PTR_ERR(priv->mdio);
 
        mii_res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
        priv->mii = devm_ioremap_resource(dev, mii_res);
-       if (!priv->mii)
-               return -ENOMEM;
+       if (IS_ERR(priv->mii))
+               return PTR_ERR(priv->mii);
 
        priv->hw_info = of_device_get_match_data(dev);
        if (!priv->hw_info)