Use Luarocks to install luacheck

Also remove worthless variable.

.github/workflows/check-release.yml

@@ -1,11 +1,15 @@
 on: [push, pull_request]
 name: Check & Release
+
 jobs:
   lint:
     runs-on: ubuntu-latest
+
     steps:
-      - uses: actions/checkout@master
-      - name: lint
-        uses: Roang-zero1/factorio-mod-luacheck@master
-        with:
-          luacheckrc_url: https://raw.githubusercontent.com/Uberi/Minetest-WorldEdit/master/.luacheckrc
+    - uses: actions/checkout@v1
+    - name: apt
+      run: sudo apt-get install -y luarocks
+    - name: luacheck install
+      run: luarocks install --local luacheck
+    - name: luacheck run
+      run: $HOME/.luarocks/bin/luacheck ./

.luacheckrc

@@ -12,10 +12,6 @@ ignore = {
     "file", "name",
 }
 
-globals = {
-	"minetest"
-}
-
 read_globals = {
     string = {fields = {"split", "trim"}},
     table = {fields = {"copy", "getn"}},
@@ -24,5 +20,5 @@ read_globals = {
     "smart_inventory", "sfinv",
 
     "VoxelArea", "inventory_plus",
-    "ItemStack",
+    "ItemStack", "minetest",
 }

worldedit_gui/init.lua

@@ -88,7 +88,6 @@ if minetest.global_exists("unified_inventory") then -- unified inventory install
 			worldedit.show_page(name, "worldedit_gui")
 			return true
 		elseif fields.worldedit_gui_exit then --return to original page
-			player = minetest.get_player_by_name(name)
 			if player then
 				unified_inventory.set_inventory_formspec(player, "craft")
 			end