message: remove unnecessary return value
diff: @@ -441,7 +441,7 @@ static const struct luaL_Reg property_m [] = {
  {NULL, NULL}
  };
  -int luaopen_structure(lua_State *L, const char *tname, const luaL_Reg *lreg, bool global) {
  +void luaopen_structure(lua_State *L, const char *tname, const luaL_Reg *lreg, bool global) {
  luaL_newmetatable(L, tname);
  lua_pushvalue(L, -1);
  lua_setfield(L, -2, "__index");
  @@ -454,7 +454,6 @@ int luaopen_structure(lua_State *L, const char *tname, const luaL_Reg *lreg, boo
  {
  lua_setglobal(L, tname);
  }
  - return 1;
  }
  void LUA_InitNWScript(lua_State *L)
  