This has caught me out several times now. Time to fix it.

Bug: b/126871859
Change-Id: Ia6fa46404ea89e55311721e4be6e37b7a94f1cd3
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/38916
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Chris Forbes <chrisforbes@google.com>
Tested-by: Ben Clayton <bclayton@google.com>