fix luacheck warnings and remove stray print()

controller.lua

@@ -74,7 +74,6 @@ local function release_player(pos)
 	local player = minetest.get_player_by_name(players_on_controller[hash])
 	if player and player:get_properties()._is_gamecontroller then
 		local parent = player:get_attach()
-		print(dump(parent:get_properties()))
 		if parent then
 			player:set_detach()
 		end

gpu.lua

@@ -213,7 +213,7 @@ local function runcommand(pos,meta,command)
 		local x1 = math.min(64,math.floor(command.x1))
 		local y1 = math.min(64,math.floor(command.y1))
 		local x2 = math.min(64,math.floor(command.x2))
-		local y2 = math.min(64,math.floor(command.y2))	
+		local y2 = math.min(64,math.floor(command.y2))
 		if x1 < 1 or y1 < 1 or x2 < 1 or y2 < 1 then return end
 		x2 = math.min(x2,buffer.xsize)
 		y2 = math.min(y2,buffer.ysize)
@@ -227,7 +227,7 @@ local function runcommand(pos,meta,command)
 				tempbuf[dsty][dstx] = buffer[y][x]
 			end
 		end
-		digiline:receptor_send(pos,digiline.rules.default,command.channel,tempbuf)
+		digilines:receptor_send(pos,digilines.rules.default,command.channel,tempbuf)
 	elseif command.command == "drawrect" then
 		if type(command.buffer) ~= "number" or type(command.x1) ~= "number" or type(command.y1) ~= "number" or type(command.x2) ~= "number" or type(command.y2) ~= "number" then return end
 		local bufnum = math.floor(command.buffer)

touchscreen.lua

@@ -332,15 +332,14 @@ minetest.register_node("digistuff:advtouchscreen", {
 		fixed = {
 			{ -0.5, -0.5, 0.4, 0.5, 0.5, 0.5 }
 		}
-    	},
-    	_digistuff_channelcopier_fieldname = "channel",
+	},
+	_digistuff_channelcopier_fieldname = "channel",
 	_digistuff_channelcopier_onset = function(pos)
 		minetest.get_meta(pos):set_int("init",1)
 		digistuff.update_ts_formspec(pos)
 	end,
 	on_receive_fields = digistuff.ts_on_receive_fields,
-	digiline = 
-	{
+	digiline = {
 		receptor = {},
 		effector = {
 			action = digistuff.ts_on_digiline_receive