Suricata

Found by my fuzzing before oss-fuzz

Reproducer is
suricata -r oppchange.pcap -k none -c suricata.yaml
with attached pap

Key steps are
- first packet from server where protocol does not get recognized (like HTTP/1.2)
- second packet from client where protocol gets recognized like GET /
+ So Suricata calls TCPProtoDetectTriggerOpposingSide as it wants to parse the first data with the now recognized protocol
+ So this first parsing succeeds and ends up calling AppLayerRequestProtocolChange(hstate->f, dp, ALPROTO_HTTP2);
+ And TCPProtoDetect is not over and finishes by calling AppLayerParserParse with the data from the second packet * AppLayerParserParse creates a new state and leaks the old one, trusting its caller to clean the memory * But TCPProtoDetect does not clean the memory :-/