From ac6a2b36f9fcfbe4865550afb6d333dec6b57578 Mon Sep 17 00:00:00 2001
From: Miao Xie <miaox@cn.fujitsu.com>
Date: Wed, 5 Dec 2012 10:56:13 +0000
Subject: [PATCH] Btrfs: fix wrong return value of btrfs_truncate_page()

ret variant may be set to 0 if we read page successfully, but it might be
released before we lock it again. On this case, if we fail to allocate a
new page, we will return 0, it is wrong, fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
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