[Piglit] CL FYI: ULP seems broken

[Aaron Watry]

Hi all,

I was working on some unit tests for the expm1 builtin cl function tonight,
and I noticed that in piglit-util-cl.c the code to probe  float/double
results and check that the result is within a given ulp sees to be treating
the ulp as an actual tolerance  instead of as a proper ulp value.

I'll try to see what I can do to fix it, but I wanted to let people know
about it, as fixing the bug may cause a bunch of math rests to start
failing if we have implementations that do not meet the precision
requirements.

--Aaron
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