fix: 因sink推流失败, 删除sink时, 拉流计数为负数问题

rtsp/rtsp_sink.go

@@ -147,7 +147,7 @@ func (s *Sink) Close() {
 
 func NewSink(id stream.SinkID, sourceId string, conn net.Conn, cb func(sdp string)) stream.Sink {
 	return &Sink{
-		stream.BaseSink{ID: id, SourceID: sourceId, Protocol: stream.TransStreamRtsp, Conn: conn},
+		stream.BaseSink{ID: id, SourceID: sourceId, State: stream.SessionStateCreated, Protocol: stream.TransStreamRtsp, Conn: conn},
 		nil,
 		cb,
 	}