fix: can't return luaL_error in check_open_window()

.github/workflows/check.yml

@@ -31,7 +31,7 @@ on:
 jobs:
   lint:
     name: Lint
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     steps:
       - name: Checkout
@@ -40,8 +40,8 @@ jobs:
       - name: Run clang-format on C files and headers
         run: |
           # "notify" me of newer clang-format version
-          if command -v clang-format-19 &> /dev/null; then
-            echo "clang-format-19 is available"
+          if command -v clang-format-16 &> /dev/null; then
+            echo "clang-format-16 is available"
             exit 2
           fi
 
@@ -51,16 +51,16 @@ jobs:
             echo "No files found"
             exit 1
           fi
-          clang-format-18 --verbose --dry-run --Werror "${files[@]}"
+          clang-format-15 --verbose --dry-run --Werror "${files[@]}"
 
       - name: Set up Lua
         uses: leafo/gh-actions-lua@35bcb06abec04ec87df82e08caa84d545348536e # v10.0.0
 
       - name: Run clang-tidy on C files and headers
         run: |
           # "notify" me of newer clang-tidy version
-          if command -v clang-tidy-19 &> /dev/null; then
-            echo "clang-tidy-19 is available"
+          if command -v clang-tidy-16 &> /dev/null; then
+            echo "clang-tidy-16 is available"
             exit 2
           fi
           
@@ -70,7 +70,7 @@ jobs:
             echo "No files found"
             exit 1
           fi
-          clang-tidy-18 --extra-arg="-I.lua/include" --warnings-as-errors="*" "${files[@]}"
+          clang-tidy-15 --extra-arg="-I.lua/include" --warnings-as-errors="*" "${files[@]}"
 
       - name: Set up LuaRocks
         uses: hishamhm/gh-actions-luarocks@master
@@ -100,7 +100,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ ubuntu-latest, windows-latest, macos-latest ]
+        os: [ ubuntu-22.04, windows-latest, macos-latest ]
         lua_version: [ '5.1', '5.2', '5.3', '5.4', 'luajit' ]
     runs-on: ${{ matrix.os }}
 

src/main.c

@@ -318,7 +318,7 @@ static int lfenster_rgb(lua_State *L) {
 static window *check_open_window(lua_State *L) {
   window *p_window = check_window(L);
   if (is_window_closed(p_window)) {
-    return luaL_error(L, "attempt to use a closed window");
+    luaL_error(L, "attempt to use a closed window");
   }
   return p_window;
 }