onewire: fix some variable declarations that should have been signed.
onewire: fix some variable declarations that should have been signed.

ourairquality/esp-open-rtos,ourairquality/esp-open-rtos,ourairquality/esp-open-rtos,ourairquality/esp-open-rtos,ourairquality/esp-open-rtos,ourairquality/esp-open-rtos