hpfs: remove unnecessary dentry_unhash on rmdir, dir rename

Hpfs has no problems with references to unlinked directories.

We leave one dentry_unhash call in place, in hpfs_unlink's strange path
where it tries to truncate a file because the disk is full.  I'm not sure
what the full story is there.

CC: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Signed-off-by: Sage Weil <sage@newdream.net>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/hpfs/namei.c

@@ -439,8 +439,6 @@ static int hpfs_rmdir(struct inode *dir, struct dentry *dentry)
 	int err;
 	int r;
 
-	dentry_unhash(dentry);
-
 	hpfs_adjust_length(name, &len);
 	hpfs_lock(dir->i_sb);
 	err = -ENOENT;
@@ -535,9 +533,6 @@ static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	struct fnode *fnode;
 	int err;
 
-	if (new_inode && S_ISDIR(new_inode->i_mode))
-		dentry_unhash(new_dentry);
-
 	if ((err = hpfs_chk_name(new_name, &new_len))) return err;
 	err = 0;
 	hpfs_adjust_length(old_name, &old_len);