Function led_set_brightness_dt 

pub unsafe extern "C" fn led_set_brightness_dt(
    spec: *const led_dt_spec,
    value: u8,
) -> i32

@brief Set LED brightness from a led_dt_spec.

@param spec LED device specification from devicetree. @param value Brightness value to set in percent. @return 0 on success, negative on error.

@see led_set_brightness()