writeback: fix ntfs with sb_has_dirty_inodes()

NTFS's if-condition on dirty inodes is not complete.  Fix it with
sb_has_dirty_inodes().

Cc: Anton Altaparmakov <aia21@cantab.net>
Cc: Ken Chen <kenchen@google.com>
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
index ad21245..3e76f3b 100644
--- a/fs/ntfs/super.c
+++ b/fs/ntfs/super.c
@@ -2381,14 +2381,14 @@
 	 */
 	ntfs_commit_inode(vol->mft_ino);
 	write_inode_now(vol->mft_ino, 1);
-	if (!list_empty(&sb->s_dirty)) {
+	if (sb_has_dirty_inodes(sb)) {
 		const char *s1, *s2;
 
 		mutex_lock(&vol->mft_ino->i_mutex);
 		truncate_inode_pages(vol->mft_ino->i_mapping, 0);
 		mutex_unlock(&vol->mft_ino->i_mutex);
 		write_inode_now(vol->mft_ino, 1);
-		if (!list_empty(&sb->s_dirty)) {
+		if (sb_has_dirty_inodes(sb)) {
 			static const char *_s1 = "inodes";
 			static const char *_s2 = "";
 			s1 = _s1;