NTFS: Adapt to kill_sb() addition.

fs/ntfs/super.c

@@ -1810,6 +1810,7 @@ static struct file_system_type ntfs_fs_type = {
 	owner:		THIS_MODULE,
 	name:		"ntfs",
 	get_sb:		ntfs_get_sb,
+	kill_sb:	kill_block_super,
 	fs_flags:	FS_REQUIRES_DEV,
 };