[BUG] Data race when TLPKTDROP while checking loss for ACK candidate #1668
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Fixes #1662
The problem is that the check for empty Receiver Loss List was done without locking, so potentially the loss list could be purged between the check and getting the contents. This way the getFirstLoss function might potentially return SRT_SEQNO_NONE (-1) and then take this value further down the processing path without checking.