mtd: nand: sh_flctl: fix error return code in flctl_probe()

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

Print and propagate the return value of platform_get_irq on failure.

This issue was detected with the help of Coccinelle.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

drivers/mtd/nand/sh_flctl.c

@@ -1141,8 +1141,8 @@ static int flctl_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0) {
-		dev_err(&pdev->dev, "failed to get flste irq data\n");
-		return -ENXIO;
+		dev_err(&pdev->dev, "failed to get flste irq data: %d\n", irq);
+		return irq;
 	}
 
 	ret = devm_request_irq(&pdev->dev, irq, flctl_handle_flste, IRQF_SHARED,