md: use rdev_read_only in restart_array

Make the read-only check in restart_array identical to the other two
read-only checks.

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Jens Axboe <[e-mail]>

drivers/md/md.c

···
 		if (test_bit(Journal, &rdev->flags) &&
 		    !test_bit(Faulty, &rdev->flags))
 			has_journal = true;
-		if (bdev_read_only(rdev->bdev))
+		if (rdev_read_only(rdev))
 			has_readonly = true;
 	}
 	rcu_read_unlock();