qmp: Always free QMPRequest with qmp_request_free()

monitor_qmp_dispatch_one() frees a QMPRequest manually, because it
needs to keep a reference to ->id.  Premature optimization.  Take an
additional reference so we can use qmp_request_free().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180703085358.13941-15-armbru@redhat.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/monitor.c b/monitor.c
index 3cc4b07788..875647f992 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4182,8 +4182,6 @@ static void monitor_qmp_dispatch_one(QMPRequest *req_obj)
     id = req_obj->id;
     need_resume = req_obj->need_resume;
 
-    g_free(req_obj);
-
     old_mon = cur_mon;
     cur_mon = mon;
 
@@ -4192,14 +4190,14 @@ static void monitor_qmp_dispatch_one(QMPRequest *req_obj)
     cur_mon = old_mon;
 
     /* Respond if necessary */
-    monitor_qmp_respond(mon, rsp, NULL, id);
+    monitor_qmp_respond(mon, rsp, NULL, qobject_ref(id));
 
     /* This pairs with the monitor_suspend() in handle_qmp_command(). */
     if (need_resume) {
         monitor_resume(mon);
     }
 
-    qobject_unref(req);
+    qmp_request_free(req_obj);
 }
 
 /*