[PATCH -next] drm/tegra: fix return value check

[Wei Yongjun]

From: Wei Yongjun <yongjun_...@trendmicro.com.cn>

In case of error, the function clk_get_parent() and 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 <yongjun_wei at trendmicro.com.cn>
---
 drivers/gpu/drm/tegra/dsi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index 1cfbace..7bc2eeb 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -914,7 +914,7 @@ static int tegra_dsi_setup_clocks(struct tegra_dsi *dsi)
        int err;

        parent = clk_get_parent(dsi->clk);
-       if (!parent)
+       if (IS_ERR(parent))
                return -EINVAL;

        err = clk_set_parent(parent, dsi->clk_parent);
@@ -969,8 +969,8 @@ static int tegra_dsi_probe(struct platform_device *pdev)

        regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        dsi->regs = devm_ioremap_resource(&pdev->dev, regs);
-       if (!dsi->regs)
-               return -EADDRNOTAVAIL;
+       if (IS_ERR(dsi->regs))
+               return PTR_ERR(dsi->regs);

        INIT_LIST_HEAD(&dsi->client.list);
        dsi->client.ops = &dsi_client_ops;