drbd: simplify condition in drbd_may_do_local_read()

fold
	if (x >= (N+1))
		return 0;
	if (x < N)
		return 0;
into
	if (x != N)
		return 0;
Signed-off-by: NPhilipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: NLars Ellenberg <lars.ellenberg@linbit.com>

drivers/block/drbd/drbd_req.c

@@ -663,9 +663,7 @@ static int drbd_may_do_local_read(struct drbd_conf *mdev, sector_t sector, int s
 
 	if (mdev->state.disk == D_UP_TO_DATE)
 		return 1;
-	if (mdev->state.disk >= D_OUTDATED)
-		return 0;
-	if (mdev->state.disk <  D_INCONSISTENT)
+	if (mdev->state.disk != D_INCONSISTENT)
 		return 0;
 	esector = sector + (size >> 9) - 1;