Inode number treated as signed int in ffs_nodealloccg

[Jaakko Heinonen]

On 2010-01-31, Scott Burns wrote:
> I imagine that this hasn't been noticed up to now since most people are 
> not exceeding the range of a signed int, even with multi-TB filesystems. 

This PR may be related to this:

	http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/133980
	http://docs.freebsd.org/cgi/mid.cgi?20090508120355.S1497

-- 
Jaakko