mptcp: zero token hash at creation time.
Otherwise the 'chain_len' filed will carry random values, some token creation calls will fail due to excessive chain length, causing unexpected fallback to TCP. Fixes: 2c5ebd00 ("mptcp: refactor token container") Reviewed-by: NMat Martineau <mathew.j.martineau@linux.intel.com> Tested-by: NChristoph Paasch <cpaasch@apple.com> Signed-off-by: NPaolo Abeni <pabeni@redhat.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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