ASoC: nuc900: 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/nuc900/nuc900-ac97.c

@@ -346,8 +346,8 @@ static int nuc900_ac97_drvprobe(struct platform_device *pdev)
 	}
 
 	nuc900_audio->irq_num = platform_get_irq(pdev, 0);
-	if (!nuc900_audio->irq_num) {
-		ret = -EBUSY;
+	if (nuc900_audio->irq_num <= 0) {
+		ret = nuc900_audio->irq_num < 0 ? nuc900_audio->irq_num : -EBUSY;
 		goto out;
 	}