curl: curl RTSP connection reuse routes response headers to the RTP callback (rtsp_conn state machine not reset between sessions)

Summary libcurl's RTSP client keeps a per-connection RTP parsing state machine in struct rtspconn state, inheader, rtplen, buf. This state machine is initialised exactly once, when a brand-new connection is allocated, and is never reset thereafter. RTSP connections are pooled and reused across...