[PATCH v3] gpio: ath79: Add missing check for platform_get_irq

[Jiasheng Jiang <jiasheng@xxxxxxxxxxx>]

Add the missing check for platform_get_irq() and return error
if it fails.
The returned error code will be dealed with in
module_platform_driver(ath79_gpio_driver) and the driver will not
be registered.

Fixes: 2b8f89e19b6d ("gpio: ath79: Add support for the interrupt controller")
Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx>
---
Changelog:

v2 -> v3:

1. Check before assigning values.

v1 -> v2:

1. Return "girq->parents[0]" instead of "-ENODEV".
---
 drivers/gpio/gpio-ath79.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-ath79.c b/drivers/gpio/gpio-ath79.c
index aa0a954b8392..d2d838ad33bb 100644
--- a/drivers/gpio/gpio-ath79.c
+++ b/drivers/gpio/gpio-ath79.c
@@ -285,7 +285,10 @@ static int ath79_gpio_probe(struct platform_device *pdev)
 					     GFP_KERNEL);
 		if (!girq->parents)
 			return -ENOMEM;
-		girq->parents[0] = platform_get_irq(pdev, 0);
+		err = platform_get_irq(pdev, 0);
+		if (err < 0)
+			return err;
+		girq->parents[0] = err;
 		girq->default_type = IRQ_TYPE_NONE;
 		girq->handler = handle_simple_irq;
 	}
-- 
2.25.1