[v3] gdi32: return non-zero v-refresh value for display devices.

[Akihiro Sagawa]

To avoid division by zero (Bug 43369).

In version 3, refine a testcase.
The refresh rate value is neither zero nor negative, thus we should test both.
Thanks for reviewing.

Signed-off-by: Akihiro Sagawa <sagawa.aki at gmail.com>
---
 dlls/gdi32/driver.c   | 2 +-
 dlls/gdi32/tests/dc.c | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

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