glbench: Fix several simple linter issues.

This is a first pass to make glbench code pass cros lint step. md5.cc
and png_helper.cc were left alone and some other linter check will be
fixed in a follow up CL.

BUG=chromium:394034
TEST=FEATURES=test emerge-link glbench

Change-Id: I53f39f66182742e5b043ea68e0deed979f4f3943
Reviewed-on: https://chromium-review.googlesource.com/245604
Trybot-Ready: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
32 files changed