This fixes decoding, broken since 7e35037.

This is similar to what was done for the normal mp3 decoder in
f4a86bc9.
---
The issue can be tested with the following realrtsp stream:
rtsp://dl.lib.brown.edu:554/areserves/1093545294660883.mp3
---
 libavcodec/mpegaudiodec_template.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/mpegaudiodec_template.c 
b/libavcodec/mpegaudiodec_template.c
index 9427dbf..9ce03ef 100644
--- a/libavcodec/mpegaudiodec_template.c
+++ b/libavcodec/mpegaudiodec_template.c
@@ -1722,6 +1722,7 @@ static int decode_frame_adu(AVCodecContext *avctx, void 
*data,
     /* update codec info */
     avctx->sample_rate = s->sample_rate;
     avctx->channels    = s->nb_channels;
+    avctx->channel_layout = s->nb_channels == 1 ? AV_CH_LAYOUT_MONO : 
AV_CH_LAYOUT_STEREO;
     if (!avctx->bit_rate)
         avctx->bit_rate = s->bit_rate;
 
-- 
1.7.9.4

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