Addresses this review comment:
https://swiftshader-review.googlesource.com/c/SwiftShader/+/29810/5/tests/VulkanUnitTests/VkInstanceFuncs.hpp#20

Change-Id: If8ea18b2090f00067e346bf55b8db1ac4c22d751
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29869Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>