[Mesa-dev] Trivial fix for ChromeOS unit test

[Lionel Landwerlin]

Hey there,

While enabling LibVA on ChromeOS with their Ozone backend (EGL/GLES2 without
X), I stumbled upon a crash.

Here is a simple patch to fix it. It's pretty much a copy/paste of a snippet
already in EGL/wayland.

Cheers,

-
Lionel