btrfs: hold a ref on the root in prepare_to_merge
We look up the reloc roots corresponding root, we need to hold a ref on that root. Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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