main: Fix deferred AtExit call.
main: Fix deferred AtExit call.

- See also https://github.com/opentable/sous/pull/510

opentable/sous,opentable/sous,opentable/sous,samsalisbury/sous,opentable/sous,samsalisbury/sous,samsalisbury/sous,samsalisbury/sous,opentable/sous,samsalisbury/sous