Remove debug that shouldn't be there.

modules/audio_filter/channel_mixer/headphone.c

@@ -642,7 +642,7 @@ static int OpenFilter( vlc_object_t *p_this )
 
     p_filter->pf_audio_filter = Convert;
     p_filter->fmt_out.audio.i_rate = p_filter->fmt_in.audio.i_rate;
-msg_Dbg( p_this, ">> HEADPHONE filter loaded" );
+
     return VLC_SUCCESS;
 }