watchdog: Convert wm831x driver to devm_kzalloc()

Saves a small amount of code and systematically eliminates leaks.
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>

drivers/watchdog/wm831x_wdt.c

@@ -199,7 +199,8 @@ static int __devinit wm831x_wdt_probe(struct platform_device *pdev)
 	if (reg & WM831X_WDOG_DEBUG)
 		dev_warn(wm831x->dev, "Watchdog is paused\n");
 
-	driver_data = kzalloc(sizeof(*driver_data), GFP_KERNEL);
+	driver_data = devm_kzalloc(&pdev->dev, sizeof(*driver_data),
+				   GFP_KERNEL);
 	if (!driver_data) {
 		dev_err(wm831x->dev, "Unable to alloacate watchdog device\n");
 		ret = -ENOMEM;
@@ -250,7 +251,7 @@ static int __devinit wm831x_wdt_probe(struct platform_device *pdev)
 				dev_err(wm831x->dev,
 					"Failed to request update GPIO: %d\n",
 					ret);
-				goto err_alloc;
+				goto err;
 			}
 
 			ret = gpio_direction_output(pdata->update_gpio, 0);
@@ -292,8 +293,6 @@ static int __devinit wm831x_wdt_probe(struct platform_device *pdev)
 err_gpio:
 	if (driver_data->update_gpio)
 		gpio_free(driver_data->update_gpio);
-err_alloc:
-	kfree(driver_data);
 err:
 	return ret;
 }