HLSSegmenter: Tweak cleanup code
HLSSegmenter: Tweak cleanup code

Still hitting a weird playback issue

StreamMachine/StreamMachine,SCPR/StreamMachine,pteich/StreamMachine,DreamNetwork/StreamMachine,pedropapa/StreamMachine,DreamNetwork/StreamMachine,pteich/StreamMachine,cdgraff/StreamMachine,pedropapa/StreamMachine,StreamMachine/StreamMachine,cdgraff/StreamMachine,SCPR/StreamMachine