Pawel Jakub Dawidek 575c1d371c Add missing mountpoint vnode locking.
This fixes panic on assertion with DEBUG_VFS_LOCKS and vfs.usermount=1 when
regular user tries to mount dataset owned by him.

MFC after:	1 week
2009-08-30 21:03:40 +00:00
..
2009-05-23 16:01:58 +00:00