From 1149ab6bd48cf3b00c59e4f8ff79fbb1cf15b94b Mon Sep 17 00:00:00 2001
From: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Date: Wed, 10 Apr 2013 11:22:50 +0000
Subject: [PATCH] Btrfs: remove some BUG_ONs() when walking backref tree

The only error return value of __add_prelim_ref() is -ENOMEM,
just return errors rather than trigger BUG_ON().

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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Reading git-format-patch failed