ring_seqno_valid indicates a successful ring cmd submission, and can be
used to avoid invalid reply decoding due to failed submit alloc.
Otherwise, the garbled VkResult will mislead into initialization failure
instead of oom.
Below cts failure is fixed:
dEQP-VK.api.device_init.create_instance_device_intentional_alloc_fail.basic
Fixes: ec131c6e55 ("venus: use instance allocator for ring allocs")
Signed-off-by: Yiwei Zhang <zzyiwei@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27026>
ecd50e70d4