mono: remove redundant checks

modules/audio_filter/channel_mixer/mono.c

@@ -351,19 +351,9 @@ static int OpenFilter( vlc_object_t *p_this )
         return VLC_EGENERIC;
     }
 
-    if( (p_filter->fmt_in.i_codec != VLC_CODEC_S16N) ||
-        (p_filter->fmt_out.i_codec != VLC_CODEC_S16N) )
-    {
-        /*msg_Err( p_this, "filter discarded (invalid format)" );*/
-        return VLC_EGENERIC;
-    }
-
     if( (p_filter->fmt_in.audio.i_format != p_filter->fmt_out.audio.i_format) ||
-        (p_filter->fmt_in.audio.i_rate != p_filter->fmt_out.audio.i_rate) ||
         (p_filter->fmt_in.audio.i_format != VLC_CODEC_S16N) ||
-        (p_filter->fmt_out.audio.i_format != VLC_CODEC_S16N) ||
-        (p_filter->fmt_in.audio.i_bitspersample !=
-                                    p_filter->fmt_out.audio.i_bitspersample))
+        (p_filter->fmt_out.audio.i_format != VLC_CODEC_S16N) )
     {
         /*msg_Err( p_this, "couldn't load mono filter" );*/
         return VLC_EGENERIC;