mesa: don't use genned but unnamed xfb objects.
If we try to draw or query an XFB object that hasn't been bound, we shouldn't return any information. This fixes a couple if cases in: GL33-CTS.transform_feedback.api_errors_test The ObjectLabel test is inspired by another test. Reviewed-by: Ian Romanick <email@example.com> Reviewed-by: Kenneth Graunke <firstname.lastname@example.org> Signed-off-by: Dave Airlie <email@example.com>
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