* riece-log.el (riece-log-lock-file): Define with defvar.
(riece-log-display-message-function): Use riece-log-lock-file as
LOCKNAME of write-region.
* riece-log.el (riece-log-lock-file): Define with defvar.
(riece-log-display-message-function): Use riece-log-lock-file as
LOCKNAME of write-region.