CHROMIUM: Fix compiler warnings

There are a few printf format bugs hidden in the warnings. I'm going to
enable -Wall -Werror.

BUG=none
TEST=`FEATURES=test emerge-${BOARD} upstart` with -Werror -Wall

Change-Id: I01510dd3b7b8e064dac0a613fd1b69dfeb68787f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/upstart/+/5427192
Commit-Queue: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
9 files changed