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fix code problems found by luacheck Second iteration of the process, now handling data/lua/wml/*.lua luacheck command used to find bugs: luacheck ./*.lua --globals wesnoth wml --codes --ignore 542 213 Additionally, error code 211 (unused variables) could be ignored, as using underscore convention `_` is controversial in wesnoth ( see https://github.com/wesnoth/wesnoth/pull/2380#discussion_r162519341 ) Actual bugs found: * items.lua, access of global `write_name` instead of local `cfg.write_name` * kill.lua, typo `primary_unit` -> `primary` * bad code style: global `i` instead of local `i` (would conflict with 3-rd party code if it would use global `i`, too)