mmc: s3cmci: Fix platform_get_irq's error checking

The platform_get_irq() function returns negative if an error occurs.
zero or positive number on success. platform_get_irq() error checking
for zero is not correct.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/s3cmci.c

@@ -1658,7 +1658,7 @@ static int s3cmci_probe(struct platform_device *pdev)
 	}
 
 	host->irq = platform_get_irq(pdev, 0);
-	if (host->irq == 0) {
+	if (host->irq <= 0) {
 		dev_err(&pdev->dev, "failed to get interrupt resource.\n");
 		ret = -EINVAL;
 		goto probe_iounmap;