logs-show.c: fix enum type in function declaration
polkit: Avoid race condition in scraping /proc

If a calling process execve()s a setuid program, it can appear to be
uid 0.  Since we're receiving requests over DBus, avoid this by simply
passing system-bus-name as a subject.
Fix capability logging when effective caps are 0

Shawn Landen> Doesn't this also skip the last '0' when it is all '0's?
              You need to keep the last one.