kern/60163

[Norikatsu Shigemura]

	I heard from Chiharu Shibata <chi at bc.mbn.or.jp> about kern/60163.
	http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/60163
	(He knew that this pr was closed, recently)

	I cannot believe sos's close reason.

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	The most significant problem is "Cannot mount CD-EXTRA
	multisession cd.".  No related /dev/acdXtY. 
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	If there are no reason expect sos' close reason, the patch
	should be committed. How about this?