ASoC: codecs: lpass-rx-macro: remove useless return

cppcheck warning:

sound/soc/codecs/lpass-rx-macro.c:1626:9: warning: Identical condition
and return expression 'ret', return value is always 0
[identicalConditionAfterEarlyExit]
 return ret;
        ^
sound/soc/codecs/lpass-rx-macro.c:1623:6: note: If condition 'ret' is
true, the function will return/exit
 if (ret)
     ^
sound/soc/codecs/lpass-rx-macro.c:1626:9: note: Returning identical
expression 'ret'
 return ret;
        ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Daniel Baluta <daniel.baluta@gmail.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20210416191144.27006-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>