nilfs2: remove unnecessary dentry_unhash from rmdir, dir rename

nilfs2 does not have problems with references to unlinked directories.

CC: KONISHI Ryusuke <konishi.ryusuke@lab.ntt.co.jp>
CC: linux-nilfs@vger.kernel.org
Signed-off-by: NSage Weil <sage@newdream.net>
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

fs/nilfs2/namei.c

@@ -334,8 +334,6 @@ static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
 	struct nilfs_transaction_info ti;
 	int err;
 
-	dentry_unhash(dentry);
-
 	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
 	if (err)
 		return err;
@@ -371,9 +369,6 @@ static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	struct nilfs_transaction_info ti;
 	int err;
 
-	if (new_inode && S_ISDIR(new_inode->i_mode))
-		dentry_unhash(new_dentry);
-
 	err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
 	if (unlikely(err))
 		return err;