vl.c: remove outdated comment

Cc: qemu-trivial@nongnu.org
Signed-off-by: NLi Qiang <liq3ea@gmail.com>
Message-Id: <1542276385-7638-1-git-send-email-liq3ea@gmail.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

vl.c

@@ -1523,9 +1523,6 @@ static int machine_help_func(QemuOpts *opts, MachineState *machine)
     return 1;
 }
 
-/***********************************************************/
-/* main execution loop */
-
 struct vm_change_state_entry {
     VMChangeStateHandler *cb;
     void *opaque;