[cod] COD2 GUID = 0 exploit

[luke at techfreak.org]

Is this an exploit on the players part, or an issue with the master server
returning their guid as zero?

> Seem players can now join COD2 servers with a GUID of 0
> making them unbanable :(
>
> See: https://bugzilla.icculus.org/show_bug.cgi?id=2566
>
>     Steve / K
>
>
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