Fix another compiler warning, introduced on Windows.
Fix another compiler warning, introduced on Windows.

kingtaurus/vogl,ValveSoftware/vogl,bclemetsonblizzard/vogl,ValveSoftware/vogl,bclemetsonblizzard/vogl,kingtaurus/vogl,ValveSoftware/vogl,kingtaurus/vogl,bclemetsonblizzard/vogl,kingtaurus/vogl,bclemetsonblizzard/vogl,ValveSoftware/vogl,bclemetsonblizzard/vogl