wm8350-regulator: fix wm8350_register_regulator error handling

In the case of platform_device_add() fail, we should call
platform_device_put() instead of platform_device_del()
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

drivers/regulator/wm8350-regulator.c

@@ -1495,7 +1495,7 @@ int wm8350_register_regulator(struct wm8350 *wm8350, int reg,
 	if (ret != 0) {
 		dev_err(wm8350->dev, "Failed to register regulator %d: %d\n",
 			reg, ret);
-		platform_device_del(pdev);
+		platform_device_put(pdev);
 		wm8350->pmic.pdev[reg] = NULL;
 	}