ASoC: Intel: atom: sst_ipc: remove useless initializations

ASoC: Intel: atom: sst_ipc: remove useless initializations

cppcheck throws invalid NULL dereference warnings but there's indeed
no need to initialize a loop variable or initialize to NULL before
allocating memory.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220520211719.607543-8-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>