ACPI: SBS: Simplify the driver init code

acpi_bus_register_driver() will check acpi_disable and return
-ENODEV, so the acpi_disable check outside the
acpi_bus_register_driver() is duplicated, can be removed.

Also we can just return from acpi_bus_register_driver() then
we can simplify the code further.
Signed-off-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/sbs.c

@@ -714,16 +714,7 @@ static struct acpi_driver acpi_sbs_driver = {
 
 static int __init acpi_sbs_init(void)
 {
-	int result = 0;
-
-	if (acpi_disabled)
-		return -ENODEV;
-
-	result = acpi_bus_register_driver(&acpi_sbs_driver);
-	if (result < 0)
-		return -ENODEV;
-
-	return 0;
+	return acpi_bus_register_driver(&acpi_sbs_driver);
 }
 
 static void __exit acpi_sbs_exit(void)