[Piglit] [PATCH] glsl-fs-user-varying-ff: make the result more reliable

[Eric Anholt]

Vadim Girlin <vadimgirlin at gmail.com> writes:

> The test is not reliable, because in the "correct" case the result is 
> "undefined" and the test tries to check it by comparing it with some constant.
> "undefined" value _probably_ will not be equal, but it still could be equal. The
> test randomly fails sometimes with r600g.
>
> Decreases probability of the false fail by probing the whole drawn rectangle
> instead of a single pixel.

If it's an undefined value, I think we should just verify that the
program runs to completion (do a readpixels, throw out the result)

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