Konstantin Belousov ef6a2be307 Assert that the msdosfs vnode is (e)locked in several places.
The plan is to use vnode lock to protect denode and fat cache,
and having separate lock for block use map.

Change the check and return on impossible condition into KASSERT().

Tested by:	pho
MFC after:	3 weeks
2010-02-28 17:07:49 +00:00
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