UML - Fix ubd_add error reporting

ubd_add returns 0 when there could actually be an error to report.

--

 arch/um/drivers/ubd_kern.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.21-mm/arch/um/drivers/ubd_kern.c
===================================================================
@@ -766,7 +766,7 @@ static int ubd_add(int n, char **error_o
 		make_ide_entries(ubd_gendisk[n]->disk_name);
 
 out:
-	return 0;
+	return err;
 
 out_cleanup:
 	blk_cleanup_queue(ubd_dev->queue);

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