ASoC: samsung: i2s: remove unassigned variable

ASoC: samsung: i2s: remove unassigned variable

cppcheck warning:

sound/soc/samsung/i2s.c:1159:18: style: Variable 'dai' is not assigned
a value. [unassignedVariable]
 struct i2s_dai *dai;
                 ^

This variable is only used for a sizeof(*dai).

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20210219230918.5058-2-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>