[PATCH -next v2] pinctrl: artpec6: Fix return value check in artpec6_pmx_probe()

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From: Wei Yongjun <weiyongjun1@xxxxxxxxxx>

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

Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
---
v1 -> v2: fix comment
---
 drivers/pinctrl/pinctrl-artpec6.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-artpec6.c b/drivers/pinctrl/pinctrl-artpec6.c
index b5a2eff..6a16019 100644
--- a/drivers/pinctrl/pinctrl-artpec6.c
+++ b/drivers/pinctrl/pinctrl-artpec6.c
@@ -938,9 +938,9 @@ static int artpec6_pmx_probe(struct platform_device *pdev)
 	pmx->num_pin_groups = ARRAY_SIZE(artpec6_pin_groups);
 	pmx->pctl	    = pinctrl_register(&artpec6_desc, &pdev->dev, pmx);
 
-	if (!pmx->pctl) {
+	if (IS_ERR(pmx->pctl)) {
 		dev_err(&pdev->dev, "could not register pinctrl driver\n");
-		return -EINVAL;
+		return PTR_ERR(pmx->pctl);
 	}
 
 	platform_set_drvdata(pdev, pmx);

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