btrfs: Use init_delayed_ref_head in add_delayed_ref_head
Use the newly introduced function when initialising the head_ref in add_delayed_ref_head. No functional changes. Signed-off-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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