fix a test that prevents division by zero restore the 100us delay after writing to an analog register since it turns out that it is required.
fix a test that prevents division by zero
restore the 100us delay after writing to an analog register since
it turns out that it is required.

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