ARM: EXYNOS: Use dev_err() instead of printk() for cpuidle driver

Change raw printk() call to dev_err() to provide a better message
to userspace so it can properly identify the device.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

arch/arm/mach-exynos/cpuidle.c

@@ -206,7 +206,7 @@ static int __init exynos_cpuidle_probe(struct platform_device *pdev)
 
 	ret = cpuidle_register_driver(&exynos4_idle_driver);
 	if (ret) {
-		printk(KERN_ERR "CPUidle failed to register driver\n");
+		dev_err(&pdev->dev, "failed to register cpuidle driver\n");
 		return ret;
 	}
 
@@ -220,7 +220,7 @@ static int __init exynos_cpuidle_probe(struct platform_device *pdev)
 
 		ret = cpuidle_register_device(device);
 		if (ret) {
-			printk(KERN_ERR "CPUidle register device failed\n");
+			dev_err(&pdev->dev, "failed to register cpuidle device\n");
 			return ret;
 		}
 	}