[Piglit] [PATCH] Fix clearbuffer-display-lists test case

[Eric Anholt]

On Tue,  7 Feb 2012 11:55:55 -0800, Anuj Phogat <anuj.phogat at gmail.com> wrote:
> glClear(GL_COLOR_BUFFER_BIT) before probing the color buffer.
> Test occasionally fails without this call.

Reviewed-by: Eric Anholt <eric at anholt.net>
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