Revert "Monitor: Return before exiting with 'quit'"

This reverts commit 0e8d2b5575.

Next commits will do the same thing in a better way.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

monitor.c

@@ -1020,8 +1020,7 @@ static void do_info_cpu_stats(Monitor *mon)
  */
 static int do_quit(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
-    monitor_suspend(mon);
-    qemu_system_exit_request();
+    exit(0);
     return 0;
 }