[PATCH -next] drm/shmob: fix return value check in shmob_drm_probe()

[Wei Yongjun]

From: Wei Yongjun <weiyongj...@huawei.com>

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().

Signed-off-by: Wei Yongjun <weiyongj...@huawei.com>
---
 drivers/gpu/drm/shmobile/shmob_drm_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/shmobile/shmob_drm_drv.c 
b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
index 800d1d2..6bd777a 100644
--- a/drivers/gpu/drm/shmobile/shmob_drm_drv.c
+++ b/drivers/gpu/drm/shmobile/shmob_drm_drv.c
@@ -235,8 +235,8 @@ static int shmob_drm_probe(struct platform_device *pdev)
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        sdev->mmio = devm_ioremap_resource(&pdev->dev, res);
-       if (sdev->mmio == NULL)
-               return -ENOMEM;
+       if (IS_ERR(sdev->mmio))
+               return PTR_ERR(sdev->mmio);
 
        ret = shmob_drm_setup_clocks(sdev, pdata->clk_source);
        if (ret < 0)