Drivers are expected to ignore unknown structs in pNext chains. Venus
is a bit weird because we advertise features based on the host driver
and so we have code for all sorts of things which may not be supported
by the host driver. When globalPriorityQuery is unsupported, we
shouldn't even attempt to return anything. Currently, we just crash in
this case because vn_physical_device::global_priority_properties is an
uninitialized pointer. While we're here, initialize it to NULL if it's
invalid.
Fixes: e488b5e45e ("venus: support VK_KHR_global_priority")
Reviewed-by: Yiwei Zhang <zzyiwei@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34218>
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