qapi: Convert change

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 886d589..bfae81f 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -110,10 +110,7 @@
     {
         .name       = "change",
         .args_type  = "device:B,target:F,arg:s?",
-        .params     = "device filename [format]",
-        .help       = "change a removable medium, optional format",
-        .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_change,
+        .mhandler.cmd_new = qmp_marshal_input_change,
     },
 
 SQMP