gpio: mockup: fix resource leak in error path

commit 1b02d9e7 upstream.

If the module init function fails after creating the debugs directory,
it's never removed. Add proper cleanup calls to avoid this resource
leak.

Fixes: 9202ba23 ("gpio: mockup: implement event injecting over debugfs")
Cc: <stable@vger.kernel.org>
Signed-off-by: NBartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/gpio/gpio-mockup.c

@@ -367,6 +367,7 @@ static int __init gpio_mockup_init(void)
 	err = platform_driver_register(&gpio_mockup_driver);
 	if (err) {
 		gpio_mockup_err("error registering platform driver\n");
+		debugfs_remove_recursive(gpio_mockup_dbg_dir);
 		return err;
 	}
 
@@ -386,6 +387,7 @@ static int __init gpio_mockup_init(void)
 			gpio_mockup_err("error registering device");
 			platform_driver_unregister(&gpio_mockup_driver);
 			gpio_mockup_unregister_pdevs();
+			debugfs_remove_recursive(gpio_mockup_dbg_dir);
 			return PTR_ERR(pdev);
 		}