K 10
svn:author
V 7
thompsa
K 8
svn:date
V 27
2009-08-29T15:42:06.227035Z
K 7
svn:log
V 301
MFC r196547

 It is possible for all the kthreads to exit (hci modules unloaded) which in
 turn ends our usb process. This means the proc pointer becomes invalid and will
 panic if a new kthread is added. Count the number of threads and clear the proc
 pointer on the last one.

Approved by:	re (kib)

END