ASoC: max9867: remove unused ‘ret’

In max9867_dai_set_fmt(), 'ret' is initialized as return value of
regmap_raw_write() but never checked, so remove this and assignement.

sound/soc/codecs/max9867.c: In function ‘max9867_dai_set_fmt’:
sound/soc/codecs/max9867.c:312:6: warning: variable ‘ret’ set but not used [-Wunused-but-set-variable]
  int ret;

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>