ASoC: Intel: sst: remove unused 'ops'

In sst_free_stream(), a variable 'ops' is initialized but
not used. So remove it.

sound/soc/intel/atom/sst/sst_stream.c: In function ‘sst_free_stream’:
sound/soc/intel/atom/sst/sst_stream.c:397:24: warning: variable ‘ops’ set but not used [-Wunused-but-set-variable]
  struct intel_sst_ops *ops;

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>