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: NArtem Bityutskiy <Artem.Bityutskiy@nokia.com>

drivers/mtd/ubi/vtbl.c

@@ -111,7 +111,7 @@ int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
 	}
 
 	paranoid_vtbl_check(ubi);
-	return ubi_wl_flush(ubi);
+	return 0;
 }
 
 /**