intel_sst: fix -Wunused-but-set-variable warnings

intel_sst: fix -Wunused-but-set-variable warnings

drivers/staging/intel_sst/intel_sst_app_interface.c: In function ‘snd_sst_fill_kernel_list’:
drivers/staging/intel_sst/intel_sst_app_interface.c:407:23: warning: variable ‘sent_index’ set but not used [-Wunused-but-set-variable]
drivers/staging/intel_sst/intel_sst_app_interface.c: In function ‘intel_sst_ioctl’:
drivers/staging/intel_sst/intel_sst_app_interface.c:1097:35: warning: variable ‘num_channel’ set but not used [-Wunused-but-set-variable]
drivers/staging/intel_sst/intel_sst_app_interface.c:1097:20: warning: variable ‘word_size’ set but not used [-Wunused-but-set-variable]
drivers/staging/intel_sst/intel_sst_app_interface.c:1097:9: warning: variable ‘sfreq’ set but not used [-Wunused-but-set-variable]
drivers/staging/intel_sst/intel_sst_app_interface.c:1224:34: warning: variable ‘mod’ set but not used [-Wunused-but-set-variable]
drivers/staging/intel_sst/intel_sst_drv_interface.c: In function ‘sst_get_stream’:
drivers/staging/intel_sst/intel_sst_drv_interface.c:277:34: warning: variable ‘response’ set but not used [-Wunused-but-set-variable]
drivers/staging/intel_sst/intel_sst_drv_interface.c: In function ‘sst_process_mad_ops’:
drivers/staging/intel_sst/intel_sst_drv_interface.c:357:6: warning: variable ‘retval’ set but not used [-Wunused-but-set-variable]
drivers/staging/intel_sst/intel_sst_ipc.c: In function ‘sst_process_message’:
drivers/staging/intel_sst/intel_sst_ipc.c:225:24: warning: variable ‘stream’ set but not used [-Wunused-but-set-variable]
drivers/staging/intel_sst/intel_sst_stream_encoded.c: In function ‘sst_play_frame’:
drivers/staging/intel_sst/intel_sst_stream_encoded.c:562:6: warning: variable ‘i’ set but not used [-Wunused-but-set-variable]
drivers/staging/intel_sst/intel_sst_stream_encoded.c: In function ‘sst_capture_frame’:
drivers/staging/intel_sst/intel_sst_stream_encoded.c:644:6: warning: variable ‘i’ set but not used [-Wunused-but-set-variable]
sound/soc/mid-x86/sst_platform.c: In function ‘sst_platform_pcm_prepare’:
sound/soc/mid-x86/sst_platform.c:354:19: warning: variable ‘str_id’ set but not used [-Wunused-but-set-variable]

Change-Id: I69f48155673805747f9c8e95c6980f3583d0ee00
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>