Ignore subsequent channel configurations after the first in an AAC file. The

current code doesn't handle them properly, and they are a dubious construction
at best.

Originally committed as revision 19399 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/aac.h

@@ -274,6 +274,8 @@ typedef struct {
     /** @} */
 
     DECLARE_ALIGNED(16, float, temp[128]);
+
+    int output_configured;
 } AACContext;
 
 #endif /* AVCODEC_AAC_H */