additional error check to (stop scanadf) + fix of it

ChangeLog

@@ -1,3 +1,7 @@
+2009-05-22  Alex Belkin <abc at telekom.ru>
+	* backend/xerox_mfp.c:
+	- additional error check to (stop scanadf) + fix of it.
+
 2009-05-22  Nicolas Martin <nicols-guest at users.alioth.debian.org>
 	* backend/pixma_imageclass.c, backend/pixma_mp730.c, sanei/sanei_usb.c:
 	- pixma_imageclass.c: supported devices list cleanup.

backend/xerox_mfp.c

@@ -1320,14 +1320,14 @@ sane_start (SANE_Handle h)
   }
 
   if (!dev_set_window(dev) ||
-      dev->state != SANE_STATUS_DEVICE_BUSY)
+      (dev->state && dev->state != SANE_STATUS_DEVICE_BUSY))
     return dev_stop(dev);
 
   if (!dev_cmd_wait(dev, CMD_OBJECT_POSITION))
     return dev_stop(dev);
 
   if (!dev_cmd(dev, CMD_READ) ||
-      dev->state != SANE_STATUS_DEVICE_BUSY)
+      (dev->state && dev->state != SANE_STATUS_DEVICE_BUSY))
     return dev_stop(dev);
 
   dev->scanning = 1;