zink: handle bogus xfb draws
drawing unpopulated xfb data is legal(?) and tested in cts, and the correct operation is to just drop the draw, so do that here
fixes (nvidia): GTF-GL46.gtf40.GL3Tests.transform_feedback2.transform_feedback2_api
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Equinix is shutting down its operations with us on April 30, 2025. They have graciously supported us for almost 5 years, but all good things come to an end.
Given the time frame, it's going to be hard to make a smooth transition of the cluster to somewhere else (TBD). Please expect in the next months some hiccups in the service and probably at least a full week of downtime to transfer gitlab to a different place.
All help is appreciated.
drawing unpopulated xfb data is legal(?) and tested in cts, and the correct operation is to just drop the draw, so do that here
fixes (nvidia): GTF-GL46.gtf40.GL3Tests.transform_feedback2.transform_feedback2_api