Staging: quickstart: acpi_status is unsigned

acpi_bus_register_driver() returns an int, not acpi_status.  It returns
zero on success and negative error codes on failure, but acpi_status is
unsigned.  We can just use "ret" here.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/quickstart/quickstart.c

@@ -398,16 +398,15 @@ static int __init quickstart_init_input(void)
 static int __init quickstart_init(void)
 {
 	int ret;
-	acpi_status status = 0;
 
 	/* ACPI Check */
 	if (acpi_disabled)
 		return -ENODEV;
 
 	/* ACPI driver register */
-	status = acpi_bus_register_driver(&quickstart_acpi_driver);
-	if (status < 0)
-		return -ENODEV;
+	ret = acpi_bus_register_driver(&quickstart_acpi_driver);
+	if (ret)
+		return ret;
 
 	/* If existing bus with no devices */
 	if (!quickstart_data.btn_lst) {