This function may be called without checking the pointer.
Speculative fix for a crash in GetSystemInfoVulkan.

Bug: chromium:1211839
Change-Id: Ia7fa55fc328d02bdcd6d48e9b93f552aaea2b284
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2917353Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>