[Bug 59970] monitor_get_dpi will get zero dmPelsWidth/dmPelsHeight in both physical/current cause divide by zero in make_ratio due to gcd return 0

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59970

--- Comment #14 from TOM <[e-mail]> ---
The following code make_ratio will pass the dpi * scale_x.num, scale_x.den/dpi
* scale_y.num, scale_y.den which will be both 0, 0
causing the gcd also pass 0,0 then return 0

the divide zero is maybe happened in make_ratio
    struct ratio r = { num / d, den / d };
bacause the d is return 0 by gcd.

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