fs/ntfs3: Remove sync_blockdev_nowait()

Flush the file mapping directly.
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

fs/ntfs3/inode.c

@@ -1093,7 +1093,7 @@ int ntfs_flush_inodes(struct super_block *sb, struct inode *i1,
 	if (!ret && i2)
 		ret = writeback_inode(i2);
 	if (!ret)
-		ret = sync_blockdev_nowait(sb->s_bdev);
+		ret = filemap_flush(sb->s_bdev_file->f_mapping);
 	return ret;
 }