K 10
svn:author
V 8
netchild
K 8
svn:date
V 27
2006-02-05T17:33:18.000000Z
K 7
svn:log
V 328
A pointer was checked for NULL after dereferencing it. The check is not
needed here, except there's a bug which results in detaching the device
twice.

Move the NULL pointer check to the beginning of the function and convert
it into a KASSERT.

CID:		420
Found with:	Coverity Prevent(tm)
Discussed with:	ariff
MFC after:	5 days

END