ASoC: generic: simple-card-utils: remove useless assignment

ASoC: generic: simple-card-utils: remove useless assignment

[ Upstream commit bd029fc86834760276171bd2301d6c43e45a65b0 ]

cppcheck warning:

sound/soc/generic/simple-card-utils.c:258:10: style: Variable 'ret' is
assigned a value that is never used. [unreadVariable]
 int ret = 0;
         ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210218221921.88991-7-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>