sga: convert to new channel layout API

Signed-off-by: James Almer <jamrial@gmail.com>

libavformat/sga.c

@@ -323,8 +323,7 @@ static int sga_audio_packet(AVFormatContext *s, AVPacket *pkt)
         st->codecpar->codec_type    = AVMEDIA_TYPE_AUDIO;
         st->codecpar->codec_tag     = 0;
         st->codecpar->codec_id      = AV_CODEC_ID_PCM_SGA;
-        st->codecpar->channels      = 1;
-        st->codecpar->channel_layout= AV_CH_LAYOUT_MONO;
+        st->codecpar->ch_layout     = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
         st->codecpar->sample_rate   = av_rescale(AV_RB16(sga->sector + 8),
                                                  SEGA_CD_PCM_NUM,
                                                  SEGA_CD_PCM_DEN);