Konstantin Belousov 6c0358cc98 Do not leak vnode lock when msdosfs mount is updated and specified
device is different from the device used to the original mount.

Note that update_mp does not need devvp locked, and pmp->pm_devvp cannot
be freed meantime.

Reported and tested by:	pho
MFC after:	3 weeks
2010-03-02 17:24:33 +00:00
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