btrfs: reloc: refactor useless nodes handling into its own function
This patch will also add some comment for the cleanup. Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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