ntfs: Use new syncing helpers and update comments

Use new syncing helpers in .write and .aio_write functions. Also
remove superfluous syncing in ntfs_file_buffered_write() and update
comments about generic_osync_inode().

CC: Anton Altaparmakov <[email protected]>
CC: [email protected]
Signed-off-by: Jan Kara <[email protected]>
2 files changed