Re: [PATCH 1/9] prio-queue: fix type of `insertion_ctr`

> In 62e745ced2 (prio-queue: use size_t rather than int for size,
> 2024-12-20), we have converted `struct prio_queue` to use `size_t` to
> track the number of entries in the queue as well as the allocated size
> of the underlying array. There is one more counter though, namely the
> insertion counter, that is still using an `unsigned` instead of a
> `size_t`. This is unlikely to ever be a problem, but it makes one wonder
> why some indices use `size_t` while others use `unsigned`. Furthermore,
> the mentioned commit stated the intent to also adapt these variables,
> but seemingly forgot to do so.
> 
> Fix the issue by converting those counters to use `size_t`, as well.