rtmp: handle bytes read reports

0x03 (bytes read report) is a known type and should be safely ignored
beside in debug situations.

libavformat/rtmpproto.c

@@ -1200,6 +1200,9 @@ static int rtmp_parse_result(URLContext *s, RTMPContext *rt, RTMPPacket *pkt)
 #endif
 
     switch (pkt->type) {
+    case RTMP_PT_BYTES_READ:
+        av_dlog(s, "received bytes read report\n");
+        break;
     case RTMP_PT_CHUNK_SIZE:
         if ((ret = handle_chunk_size(s, pkt)) < 0)
             return ret;