md: don't check 'mddev->pers' from suspend_hi_store()

Now that mddev_suspend() doean't rely on 'mddev->pers' to be set, it's
safe to remove such checking.

This will also allow the array to be suspended even before the array
is ran.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20230825030956.1527023-7-yukuai1@huaweicloud.com

drivers/md/md.c

@@ -5226,18 +5226,13 @@ suspend_hi_store(struct mddev *mddev, const char *buf, size_t len)
 	err = mddev_lock(mddev);
 	if (err)
 		return err;
-	err = -EINVAL;
-	if (mddev->pers == NULL)
-		goto unlock;
 
 	mddev_suspend(mddev);
 	mddev->suspend_hi = new;
 	mddev_resume(mddev);
 
-	err = 0;
-unlock:
 	mddev_unlock(mddev);
-	return err ?: len;
+	return len;
 }
 static struct md_sysfs_entry md_suspend_hi =
 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);