Revert unintentionally committed code.

include/sane/sanei_usb.h

@@ -241,20 +241,6 @@ extern SANE_Status sanei_usb_open (SANE_String_Const devname, SANE_Int * dn);
  */
 extern void sanei_usb_close (SANE_Int dn);
 
-/** Get the filename associated with a USB device.
- *
- * The full filename is stored into a malloc()ed string in devpath that
- * the caller must free() after use.
- *
- * @param dn device number
- * @param devpath string pointer
- *
- * @return
- * - SANE_STATUS_GOOD - on success
- * - SANE_STATUS_INVAL - on error
- */
-extern SANE_Status sanei_usb_get_device_path (SANE_Int dn, SANE_String * devpath);
-
 /** Set the libusb timeout for bulk and interrupt reads.
  * 
  * @param timeout the new timeout in ms