Make sure that the brightness value sent to acpi is one of the values in the BCL array.
Make sure that the brightness value sent to acpi is one of the values
in the BCL array.

Also add a missing acpivout_get_brightness() call
in acpivout_brightness_cycle().

ok and suggestions from pirofti@, ok miod@ deraadt@ marco@.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars