Audio: Volume: Fix condition for identical ramp

The is_same_value true was returned if target volumes are the
same. The check omitted the fact that start volumes for ramp
can be different.

This change fixes the random ignore of volume ramp and smooth
transition when a volume control is changed.

Signed-off-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>

src/audio/volume/volume.c

@@ -252,7 +252,7 @@ void volume_set_ramp_channel_counter(struct vol_data *cd, uint32_t channels_coun
  bool is_same_volume = true;
 
  for (i = 1; i < channels_count; i++) {
- if (cd->tvolume[0] != cd->tvolume[i]) {
+ if (cd->tvolume[0] != cd->tvolume[i] || cd->volume[0] != cd->volume[i]) {
  is_same_volume = false;
  break;
  }