ASoC: jz4760: fix set but not used warning

make W=1 warning:

sound/soc/codecs/jz4760.c: In function ‘jz4760_codec_startup’:
sound/soc/codecs/jz4760.c:201:6: error: variable ‘ret’ set but not
used [-Werror=unused-but-set-variable]
  201 |  int ret;
      |      ^~~

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210302205926.49063-3-pierre-louis.bossart@linux.intel.com


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