read channels calibration settings from EEPROM only once in wpi_attach() instead of doing it in wpi_init(). remove a double definition of wpi_ioctl() while i'm here.
read channels calibration settings from EEPROM only once in wpi_attach()
instead of doing it in wpi_init().
remove a double definition of wpi_ioctl() while i'm here.

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