[PATCH] glamor: fix crash when drawing nothing

[Eric Anholt]

Rob Clark <robdclark at gmail.com> writes:

> For example, in the PolyFillRect() path w/ nrect==0, we end up in
> glamor_get_vbo_space(size=0):

I wonder instead if we shouldn't just have glamor_get_vbo_space() return
NULL on size == 0?
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