flvdec: reenable extradata passing code

This fixes passing junk in stream.
It should not have any user vissible effect.
We are discarding the new data in the decoder as no case is known
where it is needed but it causes problems if used.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/aacdec.c

@@ -2556,7 +2556,7 @@ static int aac_decode_frame(AVCodecContext *avctx, void *data,
                                        AV_PKT_DATA_NEW_EXTRADATA,
                                        &new_extradata_size);
 
-    if (new_extradata) {
+    if (new_extradata && 0) {
         av_free(avctx->extradata);
         avctx->extradata = av_mallocz(new_extradata_size +
                                       FF_INPUT_BUFFER_PADDING_SIZE);

libavformat/flvdec.c

@@ -618,7 +618,7 @@ static int flv_read_packet(AVFormatContext *s, AVPacket *pkt)
             if (flv->wrong_dts)
                 dts = AV_NOPTS_VALUE;
         }
-        if (type == 0 && !st->codec->extradata) {
+        if (type == 0 && (!st->codec->extradata || st->codec->codec_id == CODEC_ID_AAC)) {
             if (st->codec->extradata) {
                 if ((ret = flv_queue_extradata(flv, s->pb, stream_type, size)) < 0)
                     return ret;