ASoC: soc-ops: remove useless assignment

cppcheck warning:

sound/soc/soc-ops.c:410:35: style: Variable 'val2' is assigned a value
that is never used. [unreadVariable]
 unsigned int val, val_mask, val2 = 0;
                                  ^

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210218221921.88991-2-pierre-louis.bossart@linux.intel.com


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