some luacheck fixes

coordinator/iocontrol.lua

@@ -18,11 +18,15 @@ local iocontrol = {}
 ---@class ioctl
 local io = {}
 
+-- luacheck push ignore
+
 -- placeholder acknowledge function for type hinting
 ---@param success boolean
 ---@diagnostic disable-next-line: unused-local
 local function __generic_ack(success) end
 
+-- luacheck pop
+
 -- initialize the coordinator IO controller
 ---@param conf facility_conf configuration
 ---@param comms coord_comms comms reference