[HarfBuzz] Another fix

[Behdad Esfahbod]

The actual fix for this bug now:

	http://bugzilla.gnome.org/show_bug.cgi?id=463430

The bug was that an intermediate index variable was of type FT_UShort
and overflowing with more than 65536 input glyphs.  Yikes!  Patch
attached.

Cheers,
-- 
behdad
http://behdad.org/

"Those who would give up Essential Liberty to purchase a little
 Temporary Safety, deserve neither Liberty nor Safety."
        -- Benjamin Franklin, 1759


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