eaa547f6f2
nvk_cmd_pool_free_gart_mem_list frees this buffer, so we need to clear
the pointers to it in order to avoid a use after free.
Fixes: 07c70c77de ("nvk: add cond render upload buffer.")
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Reviewed-by: Mary Guillemard <mary@mary.zone>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37153>