btrfs: switch return_bigger to bool in find_ref_head
Using bool is more suitable than int here, and add the comment about the return_bigger. Signed-off-by: NLu Fengqi <lufq.fnst@cn.fujitsu.com> Reviewed-by: NNikolay Borisov <nborisov@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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