The buffer for writeat() should be marked as const as the contents won't be manipulated within the call. BUG=chrome-os-partner:55932 Change-Id: I968570c1cf80f918a07b97af625a56f11b5889c1 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: https://review.coreboot.org/16084 Tested-by: build bot (Jenkins) Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-by: Furquan Shaikh <furquan@google.com>