Fix MistBuffer 100% CPU time after stream end.
Fix MistBuffer 100% CPU time after stream end.

DDVTECH/mistserver,DDVTECH/mistserver,rbouqueau/mistserver,rbouqueau/mistserver,rbouqueau/mistserver,DDVTECH/mistserver,rbouqueau/mistserver,DDVTECH/mistserver,DDVTECH/mistserver,rbouqueau/mistserver