anv: fix use of comma operator

This doesn't fix any bug at the moment because the next statement is 'true' which happens to be APIMODE_D3D, but if that changes it could.

The fixes tags is as far I could go but the error predates it (2016 is probably far enough).

Signed-off-by: Lionel Landwerlin Fixes: 8db6f2e6 ("anv/pipeline: Roll genX_pipeline_util.h into genX_pipeline.c")

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