From 4b3576e450a1539492e26e2d7b1e2e69578c032e Mon Sep 17 00:00:00 2001
From: Zhaolei <zhaolei@cn.fujitsu.com>
Date: Wed, 5 Aug 2015 18:00:02 +0800
Subject: [PATCH] btrfs: Error handle for get_ref_objectid_v0() in
 relocate_block_group()

We need error checking code for get_ref_objectid_v0() in
relocate_block_group(), to avoid unpredictable result, especially
for accessing uninitialized value(when function failed) after
this line.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
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