fix '5x5 2 fois' test case

- there is no sane_cancel call betewwen each scans in batch scanning
  so call end_scan when all data has been read from the scanner

backend/genesys.c

@@ -4076,7 +4076,7 @@ genesys_start_scan (Genesys_Device * dev, SANE_Bool lamp_off)
     }
 
   /* wait for lamp warmup : until a warmup for TRANSPARENCY is designed, skip
-   * it when scanning from XPA */
+   * it when scanning from XPA. */
   if (!(dev->model->flags & GENESYS_FLAG_SKIP_WARMUP)
     && (dev->settings.scan_method == SCAN_METHOD_FLATBED))
     {
@@ -5227,10 +5227,7 @@ Problems with the first approach:
   RIE (sanei_genesys_buffer_consume (src_buffer, bytes));
   
   /* end scan if all needed data have been read */
-  /* TODO extend this to other ASICs */
-  if(((dev->model->asic_type == GENESYS_GL847)
-    ||(dev->model->asic_type == GENESYS_GL124))
-   &&(dev->total_bytes_read >= dev->total_bytes_to_read))
+   if(dev->total_bytes_read >= dev->total_bytes_to_read)
     {
       dev->model->cmd_set->end_scan (dev, dev->reg, SANE_TRUE);
     }

backend/genesys_gl646.c

@@ -4500,7 +4500,7 @@ gl646_init_regs_for_warmup (Genesys_Device * dev,
 
   resolution = get_closest_resolution (dev->model->ccd_type, 300, SANE_FALSE);
 
-  /* set up for a half width 2 lines color scan without moving */
+  /* set up for a half width 2 lines gray scan without moving */
   settings.scan_method = SCAN_METHOD_FLATBED;
   settings.scan_mode = SCAN_MODE_GRAY;
   settings.xres = resolution;

backend/genesys_gl843.c

@@ -1976,8 +1976,7 @@ gl843_stop_action (Genesys_Device * dev)
   status = sanei_genesys_write_register (dev, REG01, val);
   if (status != SANE_STATUS_GOOD)
     {
-      DBG (DBG_error,
-	   "end_scan: failed to write register 01: %s\n",
+      DBG (DBG_error, "%s: failed to write register 01: %s\n", __FUNCTION__, 
 	   sane_strstatus (status));
       return status;
     }