nfs: Remove reference to generic_osync_inode from a comment

generic_file_direct_write() no longer calls generic_osync_inode() so remove the
comment.

CC: linux-nfs@vger.kernel.org
CC: Neil Brown <neilb@suse.de>
CC: "J. Bruce Fields" <bfields@fieldses.org>
Signed-off-by: NJan Kara <jack@suse.cz>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/direct.c

@@ -934,9 +934,6 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, const struct iovec *iov,
  * back into its cache.  We let the server do generic write
  * parameter checking and report problems.
  *
- * We also avoid an unnecessary invocation of generic_osync_inode(),
- * as it is fairly meaningless to sync the metadata of an NFS file.
- *
  * We eliminate local atime updates, see direct read above.
  *
  * We avoid unnecessary page cache invalidations for normal cached