ASoC: rt5677: remove useless assignment

cppcheck warning:

sound/soc/codecs/rt5677.c:5335:10: style: Variable 'ret' is assigned a
value that is never used. [unreadVariable]
 int ret = 0, loop, i, reg_irq, virq;
         ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210302212527.55158-22-pierre-louis.bossart@linux.intel.com


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