gdi32: Protect against short sized LOGPALETTE in CreatePalette.

[Daniel Mario Vega]

"CreatePalette(HDC, LOGPALETTE)" with a short allocated LOGPALETTE should fail 
instead of crashing (Tested against Windows XP)

---
 dlls/gdi32/palette.c       |    6 +++++-
 dlls/gdi32/tests/palette.c |   20 ++++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletions(-)
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