ASoC: ep93xx-ac97: 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: Mark Brown <broonie@kernel.org>

sound/soc/cirrus/ep93xx-ac97.c

@@ -365,7 +365,7 @@ static int ep93xx_ac97_probe(struct platform_device *pdev)
 {
 	struct ep93xx_ac97_info *info;
 	struct resource *res;
-	unsigned int irq;
+	int irq;
 	int ret;
 
 	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
@@ -378,8 +378,8 @@ static int ep93xx_ac97_probe(struct platform_device *pdev)
 		return PTR_ERR(info->regs);
 
 	irq = platform_get_irq(pdev, 0);
-	if (!irq)
-		return -ENODEV;
+	if (irq <= 0)
+		return irq < 0 ? irq : -ENODEV;
 
 	ret = devm_request_irq(&pdev->dev, irq, ep93xx_ac97_interrupt,
 			       IRQF_TRIGGER_HIGH, pdev->name, info);