video: fbdev: pxa3xx_gcu: fix error return code in pxa3xx_gcu_probe()

platform_get_irq() returns an error code, but the pxa3xx_gcu driver ignores it and always returns -ENODEV. This is not correct and, prevents -EPROBE_DEFER from being propagated properly.

Also, notice that platform_get_irq() no longer returns 0 on error:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?idã30b9a6bb35dc7097a4f02cb1ae7b6f96df92af

Print and propagate the return value of platform_get_irq on failure.

This issue was detected with the help of Coccinelle.

---
 drivers/video/fbdev/pxa3xx-gcu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index 50bce45..933619d 100644
@@ -626,8 +626,8 @@ static int pxa3xx_gcu_probe(struct platform_device *pdev)
 	/* request the IRQ */
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		dev_err(dev, "no IRQ defined\n");
-		return -ENODEV;
+		dev_err(dev, "no IRQ defined: %d\n", irq);
+		return irq;
 	}
 
 	ret = devm_request_irq(dev, irq, pxa3xx_gcu_handle_irq,

2.5.0

Patch queued for 4.14, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics