[PATCHv2] fix broken list iteration in clear_child_for_cleanup

We iterate through the list of children to cleanup, but do not keep our last pointer up to date. As a result, we may end up cutting off part of the list instead of removing a single element. Iterate through children_to_clean using 'next' fields but with an extra level of indirection. This allows

Re: [PATCHv2] fix broken list iteration in clear_child_for_cleanup

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