Dangling pointer in Gadget_List_Box_Add_Multi_Select

[xezon]

void Gadget_List_Box_Add_Multi_Select(GameWindow *list_box)
{
    _ListboxData *data = static_cast<_ListboxData *>(list_box->Win_Get_User_Data());
    captainslog_dbgassert(data != nullptr && data->m_selections == nullptr, "selections is not NULL");
    data->m_selections = new int[data->m_listLength];
    captainslog_debug("Enable list box multi select: listLength (select) = %d * %d = %d bytes;",
        data->m_listLength,
        sizeof(int),
        sizeof(int) * data->m_listLength);

    if (data->m_selections != nullptr) {
        memset(data->m_selections, -1, sizeof(int) * data->m_listLength);
        data->m_multiSelect = 1;
        list_box->Win_Set_Input_Func(Gadget_List_Box_Multi_Input);
    } else {
        delete data->m_listData;
    }
}

delete data->m_listData; needs to be followed by
data->m_listData = nullptr;