[PATCH v2] render: Fix crash in RenderAddGlyphs (#23645)

[Keith Packard]

Excerpts from Peter Hutterer's message of Tue Sep 29 22:15:21 -0700 2009:

> miGlyphs seems to deal with 0-width glyphs just fine

I guess I don't understand how this can be --
ProcRenderCompositeGlyphs passes all of the glyphs to CompositeGlyphs
which just calls down to the Glyphs function. If that is miGlyphs,
you've got a loop that looks like:

	while (n--)
	{
	    glyph = *glyphs++;
	    pPicture = GlyphPicture (glyph)[pScreen->myNum];
	    ...
	    (uses of pPicture)
    	}

I don't see how pPicture won't end up as NULL for zero-sized glyphs,
which should yield a nice segfault.

Am I missing something obvious here?

-- 
keith.packard at intel.com
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