pps: clients: gpio: Bail out on error when requesting GPIO echo line

When requesting optional GPIO echo line, bail out on error,
so user will know that something wrong with the existing property.

Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210318130321.24227-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 file changed