audio_output: same

src/audio_output/input.c

@@ -873,6 +873,8 @@ static int EqualizerCallback( vlc_object_t *p_this, char const *psz_cmd,
 static int ReplayGainCallback( vlc_object_t *p_this, char const *psz_cmd,
                                vlc_value_t oldval, vlc_value_t newval, void *p_data )
 {
+    VLC_UNUSED(psz_cmd); VLC_UNUSED(oldval);
+    VLC_UNUSED(newval); VLC_UNUSED(p_data);
     aout_instance_t *p_aout = (aout_instance_t *)p_this;
     int i;