Output the first AAC frame. This is needed for SBR conformance.

Originally committed as revision 21739 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/aac.c

@@ -2008,12 +2008,6 @@ static int aac_decode_frame(AVCodecContext *avccontext, void *data,
 
     spectral_to_sample(ac);
 
-    if (!ac->is_saved) {
-        ac->is_saved = 1;
-        *data_size = 0;
-        return buf_size;
-    }
-
     data_size_tmp = 1024 * avccontext->channels * sizeof(int16_t);
     if (*data_size < data_size_tmp) {
         av_log(avccontext, AV_LOG_ERROR,