Using NFS4_MAX_UINT64 will break current protocol.

[Needed in v3.0]
CC: Stable Tree <stable@kernel.org>
Signed-off-by: NPeng Tao <peng_tao@emc.com>
Signed-off-by: NJim Rees <rees@umich.edu>
Signed-off-by: NTrond Myklebust <Trond.Myklebust@netapp.com>