add isclose call close many times

reload.go

@@ -28,11 +28,15 @@ var ErrInitStart = errors.New("init from")
 type conn struct {
 	net.Conn
 	wg      *sync.WaitGroup
+	isclose bool
 }
 
 func (c conn) Close() error {
 	err := c.Conn.Close()
+	if !c.isclose {
 		c.wg.Done()
+		c.isclose = true
+	}
 	return err
 }