Changes

Zero residuals before doing RCS calcs

ModuleRCS doesn't have residuals and this was causing infinite spinning.

Note that it makes me worried there's some sort of floating point round
off error bug inherent to residuals, because it should have at least
worked and gotten the wrong answer.

Signed-off-by: Lamont Granquist <lamont@scriptkiddie.org>
 (commit: dbe7998)