eadler 558058eeda Don't close an uninitialized descriptor. [1]
Add a sanity check for the validity of the passed fd.

PR:		kern/139080 [1]
Submitted by:	Andrey Simonenko <simon@comsys.ntu-kpi.kiev.ua> [1]
Reviewed by:	pjd (briefly)
Approved by:	cperciva
MFC after:	1 week
2012-06-20 06:38:41 +00:00
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