Function bf_find_first_set

pub unsafe extern "C" fn bf_find_first_set(
    field: *const u8,
    size: size_t,
) -> c_int

@brief Get the index of the first set bit in the field

@param[in] field The bitfield @param[in] size The number of bits in the bitfield

@return number of the first set bit @return -1 if no bit is set