ASoC: codecs: wcd938x: fix returnvar.cocci warnings

sound/soc/codecs/wcd938x.c:1628:5-8: Unneeded variable: "ret". Return "0" on line 1656
sound/soc/codecs/wcd938x.c:1871:5-8: Unneeded variable: "ret". Return "0" on line 1907

 Remove unneeded variable used to store return value.

Generated by: scripts/coccinelle/misc/returnvar.cocci

Fixes: 04544222 ("ASoC: codecs: wcd938x: add audio routing and Kconfig")
CC: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Acked-by: Souptick Joarder <jrdr.linux@gmail.com>
Link: https://lore.kernel.org/r/20210629132909.GA7935@233d919f385f


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