[Piglit] [PATCH] glx: make sure contexts are destroyed before we exit the test

[Eric Anholt]

Timothy Arceri <tarceri at itsqueeze.com> writes:

> Without this the last two contexts that are created will not
> have been destroyed when exiting the test. This creates a race
> condition in Mesa between any threads that might be using
> glsl_types and the atexit() callback that destroys these types.

Reviewed-by: Eric Anholt <eric at anholt.net>
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