avcodec/metasound: Remove always-false checks

The number of channels that is checked here is automatically
valid because it has just been set by us (based upon an entry
in codec_props).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/metasound.c

@@ -302,11 +302,6 @@ static av_cold int metasound_decode_init(AVCodecContext *avctx)
         props++;
     }
 
-    if (channels <= 0 || channels > TWINVQ_CHANNELS_MAX) {
-        av_log(avctx, AV_LOG_ERROR, "Unsupported number of channels: %i\n",
-               channels);
-        return AVERROR_INVALIDDATA;
-    }
     av_channel_layout_uninit(&avctx->ch_layout);
     av_channel_layout_default(&avctx->ch_layout, channels);