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Refactor a bit of commonly used logic so that every site that wants a close deferred to an nfsd thread does all the right things (set_bit(XPT_CLOSE) then enqueue). Also, once XPT_CLOSE is set on a transport, it is never cleared. If XPT_CLOSE is already set, then the close is already being handled and the enqueue can be skipped. Signed-off-by: Chuck Lever <chuck.lever@oracle.com>