When verifying a superblock, the lower bound on block size is MINBSIZE (4096), not SBLOCKSIZE (8192).
When verifying a superblock, the lower bound on block size is MINBSIZE
(4096), not SBLOCKSIZE (8192).

Submitted by:	Tor.Egge@cvsup.no.freebsd.org
Sponsored by:	DARPA & NAI Labs.

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