@brief Get the next gpiochip handle.
@param iter The gpiochip iterator object.
@return Pointer to the next open gpiochip handle or NULL if no more chips
are present in the system.
@note The previous chip handle will be closed using ::gpiod_chip_iter_free.
@brief Get the next gpiochip handle. @param iter The gpiochip iterator object. @return Pointer to the next open gpiochip handle or NULL if no more chips are present in the system. @note The previous chip handle will be closed using ::gpiod_chip_iter_free.