gt68xx: 1.0.31 breaks Mustek 1248UB after first scan

It seems commit 5dd9eeb0 breaks scanner operation after the first scanned page. Please refer to [1] (in Russian).

Commit message says it was made for testing and I think the test has failed.

Reverting the commit restores operation.

As there is not a single change, I guess only this part should be removed:

@@ -2329,7 +2329,7 @@ sane_cancel (SANE_Handle handle)
       /* some scanners don't like this command when cancelling a scan */
       sanei_usb_set_timeout (SHORT_TIMEOUT);
       gt68xx_device_fix_descriptor (s->dev);
-      //gt68xx_scanner_stop_scan (s);
+      gt68xx_scanner_stop_scan (s);
       sanei_usb_set_timeout (LONG_TIMEOUT);
 
       if (s->dev->model->flags & GT68XX_FLAG_SHEET_FED)

[1] https://bugzilla.altlinux.org/show_bug.cgi?id=37739