[PATCH -next] gpio: Fix return value check in owl_gpio_probe()

[Wei Yongjun]

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

Fixes: d3654d38809c ("gpio: Add gpio driver for Actions OWL S900 SoC")
Signed-off-by: Wei Yongjun <weiyongjun1 at huawei.com>
---
 drivers/gpio/gpio-owl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-owl.c b/drivers/gpio/gpio-owl.c
index 3546362..f35e80f 100644
--- a/drivers/gpio/gpio-owl.c
+++ b/drivers/gpio/gpio-owl.c
@@ -128,8 +128,8 @@ static int owl_gpio_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	gpio->base = of_iomap(dev->of_node, 0);
-	if (IS_ERR(gpio->base))
-		return PTR_ERR(gpio->base);
+	if (!gpio->base)
+		return -ENOMEM;
 
 	/*
 	 * Get the number of gpio's for this bank. If none specified,