[Intel-gfx] [CI][Patchwork] Bug fixed when using vetted tests/hosts in result comparison

[Tomi Sarvela]

Hello,

A bug was found in IGT result comparison, which outputs the Patchwork 
(intel-gfx, intel-gfx-trybot, igt) textual results. Vetted lists were 
not properly handled due to missing 'global' in function.

This bug has been there probably all the way since vetted was 
introduced, and not tested properly because there was no blacklists in 
that time.

I'll re-run couple days worth of newest patchset results, so there will 
be duplicate (but more green) result emails to the mailing list and 
authors. Sorry for the noise.

Best regards,

Tomi Sarvela
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