Fixed cleanup code to exit after signal is caught

After catching a signal, the code would just return after
cleaning up rather than exiting.

BUG=chromium:240411
TEST=ran usync on client and used ^C

Change-Id: Ie659d03facb39aa8f10876ce1ed1c65a4f954b79
Reviewed-on: https://gerrit.chromium.org/gerrit/61429
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
Tested-by: Paul Taysom <taysom@chromium.org>
Commit-Queue: Paul Taysom <taysom@chromium.org>
1 file changed