avformat/flvenc: Check audio packet size

Fixes: Assertion failure
Fixes: assert_flvenc.c:941_1.swf
Found-by: #CHEN HONGXU# <HCHEN017@e.ntu.edu.sg>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 6b67d7f0)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/flvenc.c

@@ -514,6 +514,11 @@ static int flv_write_packet(AVFormatContext *s, AVPacket *pkt)
     uint8_t *data = NULL;
     int flags = -1, flags_size, ret;
 
+    if (enc->codec_type == AVMEDIA_TYPE_AUDIO && !pkt->size) {
+        av_log(s, AV_LOG_WARNING, "Empty audio Packet\n");
+        return AVERROR(EINVAL);
+    }
+
     if (enc->codec_id == AV_CODEC_ID_VP6F || enc->codec_id == AV_CODEC_ID_VP6A ||
         enc->codec_id == AV_CODEC_ID_VP6  || enc->codec_id == AV_CODEC_ID_AAC)
         flags_size = 2;