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ptp: Initialize expected DELAY_REQ seqnum to an invalid value

Sebastian Dröge requested to merge slomo/gstreamer:ptp-delay-req-seqnum-uninit into main

This allows distinguishing pending syncs that didn't have a DELAY_REQ sent from ones that did but used a seqnum of 0, like the very first one.

Specifically, if the first one or more syncs are still pending and we send the first DELAY_REQ for a later pending sync, then the DELAY_RESP would've been wrongly associated to the very first pending sync because of the seqnum.

Fixes #3383 (closed)

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