misc sanity checks in freetype.c (take II)

[Dave_Belanger at cimmetry.com]

I'm resubmitting this patch. Fixed a little logic error.

Dave Belanger
Cimmetry Systems Inc.
dave.belanger at cimmetry.com
(514) 735-3219 (ext. 204)
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(See attached file: patch_ft_sanitychecks.txt)
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