panic: cleaned vnode isn't

[Matthew Dillon]

    Ok, the fix has been committed to HEAD.  This time for sure.
    Please retest w/ the latest.

    Basically it turned out to be a vgone*() recursion.  allocfreevnode()
    vgone*()'s the vnode it is trying to recycle.  That called into HAMMER's
    hammer_vop_inactive() which then called vrecycle() and recursively
    called vgone*() again.  As the recursion returned the vnode will have
    already been destroyed/reused and it was being modified after the
    fact.

						-Matt