[PATCH] render: Fix crash in RenderAddGlyphs (#23645)

[Keith Packard]

Excerpts from Peter Hutterer's message of Tue Sep 29 15:20:33 -0700 2009:

> Tested with Xvfb, Xephyr and Xorg.

It looks to me like miGlyphs will crash when it sees 0 sized glyphs.

Also, I'd also suggest memset'ing the Picture pointers after the
glyph.

-keith
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