btrfs_unselect_ref_head
void btrfs_unselect_ref_head(struct btrfs_delayed_ref_root *delayed_refs,
btrfs_unselect_ref_head(delayed_refs, head);
btrfs_unselect_ref_head(delayed_refs, locked_ref);
btrfs_unselect_ref_head(delayed_refs, locked_ref);
btrfs_unselect_ref_head(delayed_refs, head);
btrfs_unselect_ref_head(&trans->transaction->delayed_refs, head);
btrfs_unselect_ref_head(delayed_refs, head);