avtp: crf: Remove superfluous sink_event variable
This variable was introduced by commit 12ad2a4b ("avtp: Introduce the CRF Sync Element") but it was never used:
$ git log -G "sink_event" -- ext/avtp
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This variable was introduced by commit 12ad2a4b ("avtp: Introduce the CRF Sync Element") but it was never used:
$ git log -G "sink_event" -- ext/avtp