gdi32: The text extents functions fail if passed a -ve count.

[Huw Davies]

---
 dlls/gdi32/font.c       |   37 ++++++++++++++++++++++++++-----------
 dlls/gdi32/tests/font.c |    9 +++++++++
 2 files changed, 35 insertions(+), 11 deletions(-)

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