K 10
svn:author
V 2
ed
K 8
svn:date
V 27
2010-07-06T08:56:34.119863Z
K 7
svn:log
V 283
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
MFC after:	1 week

END