Patch for [Bug 16087] wine spews innumerable "Unable to check compatibility for Format..." errors in some games

[Henri Verbeet]

2008/11/18 Stefan Dösinger <stefan at codeweavers.com>:
> I think it would be better f getColorBits returned a proper error to the
> caller, and the caller handles these errors without spamming the FIXME or
> ERR channel. That would seem better to me than prefiltering the parameters
>
It does, it returns FALSE for "unsupported" formats. The only thing
the patch fixes is the FIXME & ERR output. I think there are places
where we'd like getColorBits() to work properly for float formats
though.