K 10 svn:author V 2 ed K 8 svn:date V 27 2010-07-13T11:04:46.132011Z K 7 svn:log V 288 MFC r209718: Fix a race condition, where a TTY could be destroyed twice. There are special cases where tty_rel_free() can be called twice in a row, namely when closing and revoking the TTY at the same moment. Only call destroy_dev_sched_cb() once. Reported by: Jeremie Le Hen END