platform/x86: quickstart: Use devm_mutex_init()

Use devm_mutex_init() instead of hand-writing it.

This saves some LoC, improves readability and saves some space in the
generated .o file.

Before:
======
text data bss dec hex filename
7607 2616 64 10287 282f drivers/platform/x86/quickstart.o

After:
=====
text data bss dec hex filename
7301 2544 64 9909 26b5 drivers/platform/x86/quickstart.o

Signed-off-by: Christophe JAILLET <[e-mail]>
Link: https://lore.kernel.org/r/530b930c98[e-mail]
Reviewed-by: Ilpo Järvinen <[e-mail]>
Signed-off-by: Ilpo Järvinen <[e-mail]>

drivers/platform/x86/quickstart.c

···
 	acpi_remove_notify_handler(handle, ACPI_DEVICE_NOTIFY, quickstart_notify);
 }
 
-static void quickstart_mutex_destroy(void *data)
-{
-	struct mutex *lock = data;
-
-	mutex_destroy(lock);
-}
-
 static int quickstart_probe(struct platform_device *pdev)
 {
 	struct quickstart_data *data;
···
 	data->dev = &pdev->dev;
 	dev_set_drvdata(&pdev->dev, data);
 
-	mutex_init(&data->input_lock);
-	ret = devm_add_action_or_reset(&pdev->dev, quickstart_mutex_destroy, &data->input_lock);
+	ret = devm_mutex_init(&pdev->dev, &data->input_lock);
 	if (ret < 0)
 		return ret;