Merge remote-tracking branch 'remotes/armbru/tags/pull-monitor-2018-07-11' into staging

Monitor patches for 2018-07-11

# gpg: Signature made Wed 11 Jul 2018 20:12:31 BST
# gpg:                using RSA key 3870B400EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>"
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* remotes/armbru/tags/pull-monitor-2018-07-11:
  monitor: fix double-free of request error
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

monitor.c

@@ -4186,6 +4186,7 @@ static void monitor_qmp_bh_dispatcher(void *data)
     } else {
         assert(req_obj->err);
         rsp = qmp_error_response(req_obj->err);
+        req_obj->err = NULL;
         monitor_qmp_respond(req_obj->mon, rsp, NULL);
         qobject_unref(rsp);
     }