[PATCH] glamor: don't do copy if we have 0 boxes to copy.

[Eric Anholt]

Dave Airlie <airlied at gmail.com> writes:

> From: Dave Airlie <airlied at redhat.com>
>
> This happens if you run twm + mplayer + xclock and drag
> the clock over the mplayer. If we don't catch it, we cause
> an illegal draw elements command to be passed to GL.

What exactly is the error?  I was thinking it would be something about
count == 0, but that's not an error apparently.  If there is one about
count == 0, shouldn't we just have
glamor_gldrawarrays_quads_using_indices() do the short circuit so the
callers don't have to worry about it?
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