city_units_upkeep(): Pointless memset()
city_units_upkeep() fills free_uk[] with zero by memset(). That's pointless, as all relevant values get assigned (none left uninitialized, or just added to)
city_units_upkeep() fills free_uk[] with zero by memset(). That's pointless, as all relevant values get assigned (none left uninitialized, or just added to)