Re: [PATCH 1/9] string-list: add string_list_{pop, last} functions

> Add a few functions to allow a string-list to be used as a stack:
> 
>  - string_list_last() lets a caller peek the string_list_item at the
>    end of the string list.  The caller needs to be aware that it is
>    borrowing a pointer, which can become invalid if/when the
>    string_list is resized.
> 
>  - string_list_pop() removes the string_list_item at the end of
>    the string list.
> 
>  - _pop usually has a friend _push. This role is taken by
>     string_list_append already, as they are not symmetrical
>     in our code base: _append returns the pointer, such that
>     adding a util is easy, but _pop doesn't return such a pointer.
> 
> You can use them in this pattern:
> 
>     while (list.nr) {
>         struct string_list_item *item = string_list_last(&list);
> 
>         work_on(item);
>         string_list_pop(&list);