refs #42153, quit watchdog correctly.

Change-Id: Ib52242a6b7e1e764e4470732a969d59486c9379f
Signed-off-by: Eric Wang <leiw@mozy.com>
Reviewed-on: https://gerrit.dechocorp.com/29454
Reviewed-by: Kevin Cai <kcai@vmware.com>
Reviewed-by: Jenkins <hudsonbuild@mozy.com>

mordor/daemon.cpp

@@ -422,7 +422,7 @@ static int watchdog(int argc, char** argv,
             }
             if (done) {
                 MORDOR_LOG_INFO(g_log) << "Watchdog stopped";
-                break;
+                return 0;
             }
         }
     }