Although I assume that this should be caught by the validation layers,
recently while triaging the following tests:
dEQP-VK.ycbcr.query.*r8g8b8a8_unorm*
We found that they were setting a descriptorCount of zero, because it
was not handling correctly the differences between Vulkan 1.0 and
Vulkan 1.1.
So let's just assert, just in case it happens again, as that would
make the bugfixing far easier.
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8614>
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