[v4] gdi32: return non-zero v-refresh value for display devices.

[Akihiro Sagawa]

To avoid division by zero (Bug 43369).

In version 4, use hdc instead of ref_dc in tests.
Thanks for reviewing so many times.

Signed-off-by: Akihiro Sagawa <sagawa.aki at gmail.com>
---
 dlls/gdi32/driver.c   | 2 +-
 dlls/gdi32/tests/dc.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

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