monitor: convert do_cpu_set() to QObject, QError

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

monitor.c

@@ -807,11 +807,11 @@ static void do_info_cpus(Monitor *mon, QObject **ret_data)
     *ret_data = QOBJECT(cpu_list);
 }
 
-static void do_cpu_set(Monitor *mon, const QDict *qdict)
+static void do_cpu_set(Monitor *mon, const QDict *qdict, QObject **ret_data)
 {
     int index = qdict_get_int(qdict, "index");
     if (mon_set_cpu(index) < 0)
-        monitor_printf(mon, "Invalid CPU index\n");
+        qemu_error_new(QERR_INVALID_CPU_INDEX);
 }
 
 static void do_info_jit(Monitor *mon)

qemu-monitor.hx

@@ -573,7 +573,8 @@ ETEXI
         .args_type  = "index:i",
         .params     = "index",
         .help       = "set the default CPU",
-        .mhandler.cmd = do_cpu_set,
+        .user_print = monitor_user_noop,
+        .mhandler.cmd_new = do_cpu_set,
     },
 
 STEXI