UBI: do not flush queue on each vtbl change

This is just not necessary. We re-write whole layout copy, so
the old contents cannot show up again sice scan process will
drop it.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/drivers/mtd/ubi/vtbl.c b/drivers/mtd/ubi/vtbl.c
index d8222db..56fc3fb 100644
--- a/drivers/mtd/ubi/vtbl.c
+++ b/drivers/mtd/ubi/vtbl.c
@@ -111,7 +111,7 @@
 	}
 
 	paranoid_vtbl_check(ubi);
-	return ubi_wl_flush(ubi);
+	return 0;
 }
 
 /**