When asked to add the ST controls warn only if the st_data is missing.
In this way we do not block the otherwise functional card to probe.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Acked-by: Jarkko Nikula <jarkko.nikula@bitmer.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>