wtv: convert to new channel layout API

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

libavformat/wtvdec.c

@@ -584,11 +584,9 @@ static void parse_mpeg1waveformatex(AVStream *st)
     switch (AV_RL16(st->codecpar->extradata + 6)) {
     case 1 :
     case 2 :
-    case 4 : st->codecpar->channels       = 2;
-             st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
+    case 4 : st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
              break;
-    case 8 : st->codecpar->channels       = 1;
-             st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
+    case 8 : st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
              break;
     }
 }