gst/asfdemux/asfpacket.c: If packet size is specified within the packet and smaller...

gst/asfdemux/asfpacket.c: If packet size is specified within the packet and smaller than the actual packet size, don'...

Original commit message from CVS:
* gst/asfdemux/asfpacket.c: (gst_asf_demux_parse_payload),
(gst_asf_demux_parse_packet):
If packet size is specified within the packet and smaller than
the actual packet size, don't parse beyond the size specified in
the packet (this makes us parse some cases of packets with single
compressed payloads cleanly, see e.g stream from #431318). Also
add a sanity check when parsing compressed single payloads.