monitor: call sortcmdlist() only one time

It doesn't need to be done for every monitor, so change it.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

monitor.c

diff --git a/monitor.c b/monitor.c
index b8f79a5..457948d 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4763,6 +4763,7 @@
 
     if (is_first_init) {
         monitor_protocol_event_init();
+        sortcmdlist();
         is_first_init = 0;
     }
 
@@ -4792,8 +4793,6 @@
     QLIST_INSERT_HEAD(&mon_list, mon, entry);
     if (!default_mon || (flags & MONITOR_IS_DEFAULT))
         default_mon = mon;
-
-    sortcmdlist();
 }
 
 static void bdrv_password_cb(Monitor *mon, const char *password, void *opaque)