As diagnosed by GCC 13:
dlls/localspl/provider.c: In function ‘fill_builtin_form_info’: dlls/localspl/provider.c:3045:16: warning: ‘res_len’ may be used uninitialized [-Wmaybe-uninitialized] 3045 | if (res_len) | ^
-- v3: localspl: Avoid uninitialized variable in fill_builtin_form_info