ds2781_battery: Replace call to kzalloc with devm_kzalloc

With devm_kzalloc there is no need of freeing at the errorpath and also
at unregister it.
Signed-off-by: Devendra Naga <develkernel412222@gmail.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>

drivers/power/ds2781_battery.c

@@ -755,11 +755,9 @@ static int __devinit ds2781_battery_probe(struct platform_device *pdev)
 	int ret = 0;
 	struct ds2781_device_info *dev_info;
 
-	dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);
-	if (!dev_info) {
-		ret = -ENOMEM;
-		goto fail;
-	}
+	dev_info = devm_kzalloc(&pdev->dev, sizeof(*dev_info), GFP_KERNEL);
+	if (!dev_info)
+		return -ENOMEM;
 
 	platform_set_drvdata(pdev, dev_info);
 
@@ -774,7 +772,7 @@ static int __devinit ds2781_battery_probe(struct platform_device *pdev)
 	ret = power_supply_register(&pdev->dev, &dev_info->bat);
 	if (ret) {
 		dev_err(dev_info->dev, "failed to register battery\n");
-		goto fail_free_info;
+		goto fail;
 	}
 
 	ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
@@ -808,8 +806,6 @@ static int __devinit ds2781_battery_probe(struct platform_device *pdev)
 	sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);
 fail_unregister:
 	power_supply_unregister(&dev_info->bat);
-fail_free_info:
-	kfree(dev_info);
 fail:
 	return ret;
 }
@@ -823,7 +819,6 @@ static int __devexit ds2781_battery_remove(struct platform_device *pdev)
 
 	power_supply_unregister(&dev_info->bat);
 
-	kfree(dev_info);
 	return 0;
 }