mixer: remove assignment to unused variable
mixer: remove assignment to unused variable

This commit fixes below compiler warnings.

sbase.c:327:16: warning: variable ‘values’ set but not used [-Wunused-but-set-variable]
  unsigned long values;
                ^

Signed-off-by: Takashi Sakamoto <d5ec7d0cd8074757a1f5eb708bc105c3065a65ea@sakamocchi.jp>
Signed-off-by: Takashi Iwai <4596b3305151c7ee743192a95d394341e3d3b644@suse.de>

alsa-project/alsa-lib,tiwai/alsa-lib,alsa-project/alsa-lib,zedongchen/alsa-lib,zedongchen/alsa-lib,tiwai/alsa-lib,takaswie/alsa-lib,takaswie/alsa-lib,zedongchen/alsa-lib,zedongchen/alsa-lib,takaswie/alsa-lib,alsa-project/alsa-lib,zedongchen/alsa-lib,takaswie/alsa-lib,tiwai/alsa-lib,takaswie/alsa-lib,tiwai/alsa-lib,alsa-project/alsa-lib