/apps/twnlua: propagate errors in physfs_loader()

apps/twnlua/game.c

@@ -34,10 +34,10 @@ static int physfs_loader(lua_State *L) {
     free(final_path);
 
     /* TODO: use reader interface for streaming instead */
-    luaL_loadbuffer(L, (char *)buf, buf_size, name);
+    int const result = luaL_loadbuffer(L, (char *)buf, buf_size, name) == LUA_OK;
     free(buf);
 
-    return 1;
+    return result;
 }