[PATCH] gpio: iop: fix devm_ioremap_resource() return value checking

[Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>]

devm_ioremap_resource() returns a pointer to the remapped memory or
an ERR_PTR() encoded error code on failure.  Fix the check inside
iop3xx_gpio_probe() accordingly.

Cc: Lennert Buytenhek <kernel@xxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Mikael Pettersson <mikpe@xxxxxxxx>
Cc: Aaro Koskinen <aaro.koskinen@xxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
---
Compile tested only.

 drivers/gpio/gpio-iop.c |    2 ++
 1 file changed, 2 insertions(+)

Index: b/drivers/gpio/gpio-iop.c
===================================================================
--- a/drivers/gpio/gpio-iop.c	2014-03-14 16:45:08.152724313 +0100
+++ b/drivers/gpio/gpio-iop.c	2014-03-18 10:50:01.903194680 +0100
@@ -111,6 +111,8 @@ static int iop3xx_gpio_probe(struct plat
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 
 	return gpiochip_add(&iop3xx_chip);
 }

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