[HarfBuzz] segfault problem

[Pierre Marchand]

Hello,
I was testing the shaper and finally found a memset call without check of the 
pointer (see diif) which eventually caused a segmentation fault. I was quite 
sure the buffer used by a shaper has not to be allocated by user, if I’m 
wrong, please tell me.

The font that caused that is here : 
http://www.selapa.net/testfonts/ScheherazadeRegOT.ttf

A screen shot that show face->gpos > 0 when face->buffer->position = 0 
http://www.fontmatrix.net/tmp/Harfbuzz_segfault.png

-- 
Pierre Marchand
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