btrfs: adjust return values of btrfs_inode_by_name

/*

 * this returns the key found in the dir entry in the location pointer.

 * If no dir entries were found, location->objectid is 0.

 * If no dir entries were found, returns -ENOENT.

 * If found a corrupted location in dir entry, returns -EUCLEAN.

 */

static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,

			       struct btrfs_key *location)

	di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(BTRFS_I(dir)),

			name, namelen, 0);

	if (IS_ERR(di))

	if (!di) {

		ret = -ENOENT;

		goto out;

	}

	if (IS_ERR(di)) {

		ret = PTR_ERR(di);

	if (IS_ERR_OR_NULL(di))

		goto out_err;

		goto out;

	}

	btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);

	if (location->type != BTRFS_INODE_ITEM_KEY &&

	    location->type != BTRFS_ROOT_ITEM_KEY) {

		ret = -EUCLEAN;

		btrfs_warn(root->fs_info,

"%s gets something invalid in DIR_ITEM (name %s, directory ino %llu, location(%llu %u %llu))",

			   __func__, name, btrfs_ino(BTRFS_I(dir)),

			   location->objectid, location->type, location->offset);

		goto out_err;

	}

out:

	btrfs_free_path(path);

	return ret;

out_err:

	location->objectid = 0;

	goto out;

}

/*

	if (ret < 0)

		return ERR_PTR(ret);

	if (location.objectid == 0)

		return ERR_PTR(-ENOENT);

	if (location.type == BTRFS_INODE_ITEM_KEY) {

		inode = btrfs_iget(dir->i_sb, &location, root, NULL);

		return inode;