ARM: samsung: Omit superfluous error message in s3c_adc_probe()

In the function s3c_adc_probe(), when get irq failed, the function
platform_get_irq() logs an error message, so remove redundant
message here.
Signed-off-by: Shengju Zhang <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/plat-samsung/adc.c

@@ -354,10 +354,8 @@ static int s3c_adc_probe(struct platform_device *pdev)
 	}
 
 	adc->irq = platform_get_irq(pdev, 1);
-	if (adc->irq <= 0) {
-		dev_err(dev, "failed to get adc irq\n");
+	if (adc->irq <= 0)
 		return -ENOENT;
-	}
 
 	ret = devm_request_irq(dev, adc->irq, s3c_adc_irq, 0, dev_name(dev),
 				adc);