From b9e03af0bcc11310f6be4a3951c9ee2c26465011 Mon Sep 17 00:00:00 2001
From: Li Zefan <lizf@cn.fujitsu.com>
Date: Wed, 23 Mar 2011 10:43:58 +0800
Subject: [PATCH] Btrfs: Check if btrfs_next_leaf() returns error in
 btrfs_real_readdir()

btrfs_next_leaf() can return -errno, and we should propagate
it to userspace.

This also simplifies how we walk the btree path.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
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