totemconfig: Suppress coverity unused_value errors

All of unused_value error instances are actually example of good
defense programming style and removing them would make code worse and
less ready for future changes so add coverity specific comment
to suppress these errors.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>