Mostly typos and one case of a return not being error checked.
Change-Id: Id33e93402b05c165aa129bb22e4b0c7f55b0a71b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/79141
Kokoro: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>