Btrfs: make sure we cleanup all reloc roots if error happens
I hit an oops when merging reloc roots fails, the reason is that new reloc roots may be added and we should make sure we cleanup all reloc roots. Signed-off-by: NWang Shilong <wangsl.fnst@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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