btrfs: simplify insert_orphan_item

We can search and add the orphan item in one go,
btrfs_insert_orphan_item will find out if the item already exists.
Signed-off-by: NDavid Sterba <dsterba@suse.cz>

fs/btrfs/tree-log.c

@@ -1254,21 +1254,13 @@ static noinline int add_inode_ref(struct btrfs_trans_handle *trans,
 }
 
 static int insert_orphan_item(struct btrfs_trans_handle *trans,
-			      struct btrfs_root *root, u64 offset)
+			      struct btrfs_root *root, u64 ino)
 {
 	int ret;
-	struct btrfs_path *path;
-
-	path = btrfs_alloc_path();
-	if (!path)
-		return -ENOMEM;
 
-	ret = btrfs_find_item(root, path, BTRFS_ORPHAN_OBJECTID,
-			offset, BTRFS_ORPHAN_ITEM_KEY, NULL);
-	if (ret > 0)
-		ret = btrfs_insert_orphan_item(trans, root, offset);
-
-	btrfs_free_path(path);
+	ret = btrfs_insert_orphan_item(trans, root, ino);
+	if (ret == -EEXIST)
+		ret = 0;
 
 	return ret;
 }