ASoC: codecs: wcd934x: return correct value from mixer put

wcd934x_compander_set() currently returns zero eventhough it changes the value.
Fix this, so that change notifications are sent correctly.

Fixes: 1cde8b82

 ("ASoC: wcd934x: add basic controls")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20211130160507.22180-4-srinivas.kandagatla@linaro.org


Signed-off-by: Mark Brown <broonie@kernel.org>