gdi32: Check the region handle in GetClipRgn later.

[Andrew Nguyen]

This helps the Garmin Training Center application.

---
 dlls/gdi32/clipping.c       |    2 +-
 dlls/gdi32/tests/clipping.c |   88 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 89 insertions(+), 1 deletions(-)
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