platform_device_unregister() only calls platform_device_del() and
platform_device_put(), thus use platform_device_unregister() to
simplify the code.
Also the documents in platform.c shows that platform_device_del
and platform_device_put must _only_ be externally called in error
cases.  All other usage is a bug.
dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
                            GFP_KERNEL);
        if (!gpio) {
                dev_err(&pdev->dev, "GPIO allocating memory error\n");
-               platform_device_del(pdev);
-               platform_device_put(pdev);
+               platform_device_unregister(pdev);
                return -ENOMEM;
        }