fix up printf settings

Mark the printf style func as such and fix up the resulting warnings.

BUG=None
TEST=precq passes

Change-Id: I8d4cd9ffa697ab91d42017b0a88a426e38d2faf6
Reviewed-on: https://chromium-review.googlesource.com/262673
Trybot-Ready: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Daniel Ehrenberg <dehrenberg@chromium.org>