kmsro: Fix confusing comma expression

kmsro: Fix confusing comma expression

It looks like this was a copy-and-paste mistake in 827e0d6654a2 where
the initialiser was moved from being a struct initialiser to a
standalone statement. Some of them were fixed with an unrelated change
in 187218395d7c but not all of them. This shouldn’t make any practical
difference to the compiled code.

Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11090>