Re: [PATCH 0/1] MR1960: localspl: Avoid uninitialized variable in fill_builtin_form_info

[Huw Davies (＠huw)]

This isn't actually a real problem, however let's just initialise `res_len` in its definition.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/1960#note_20910