qmp: constify QmpCommand and list

Since 0b69f6f72ce47a37a749b056b6d5ec64c61f11e8 "qapi: remove
qmp_unregister_command()", the command list can be declared const.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Damien Hedde <damien.hedde@greensocs.com>
Message-Id: <20200316171824.2319695-1-marcandre.lureau@redhat.com>
[Rebased]
Signed-off-by: Markus Armbruster <armbru@redhat.com>
diff --git a/monitor/monitor-internal.h b/monitor/monitor-internal.h
index 3e6baba..8f60ccc 100644
--- a/monitor/monitor-internal.h
+++ b/monitor/monitor-internal.h
@@ -133,7 +133,7 @@
      * qmp_capabilities succeeds, we go into command mode, and
      * @command becomes &qmp_commands.
      */
-    QmpCommandList *commands;
+    const QmpCommandList *commands;
     bool capab_offered[QMP_CAPABILITY__MAX]; /* capabilities offered */
     bool capab[QMP_CAPABILITY__MAX];         /* offered and accepted */
     /*