suzerain: correct consistent count checking

I had written "|=" which is next to useless.  The rewrite
provides a nicer return value to help in tracking down mistakes.

Also, fixes a bug where I'd not accumulated S2rhoE and friends
correctly when they were recently added as part of #3089.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@45123 0bd85f0b-c151-43b9-a1e9-27231104551f