Otherwise both resulting takss will print what they had flushed when they
exit.

This fixes https://bugs.launchpad.net/bugs/1389244Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
Tested-by: Tycho Andersen <tycho.andersen@canonical.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>