Trim trailing white space from source code

Trim trailing white space from source code

Normally, git's pre-commit hook protects us from them.  However, when
expected test output contains trailing white space, we have to bypass
commit hooks.  Unwanted space can then slip in if you don't pay
attention.  I obviously didn't; clean up.

The previous commit should reduce the need for such hook suppression.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>