[Piglit] Regression with eeec306bc2197a2fc0eeb064462a1244d39c16fa "framework: don't report failed cases as PASS"

[Tom Stellard]

Hi Homer,

This commit introduces a regression in piglit for reporting subtest
results.  Now if one subtests fails, all subtests report failure, which
is incorrect.  I've looked through the changes in this commit, and I
don't understand which change introduced the regression, could you take
a look?

Thanks,
Tom