mptcp: fix a DSS option writing error
'ptr += 1;' was omitted in the original code. If the DSS is the last option -- which is what we have most of the time -- that's not an issue. But it is if we need to send something else after like a RM_ADDR or an MP_PRIO. Fixes: 1bff1e43 ("mptcp: optimize out option generation") Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: Geliang Tang <geliang.tang@suse.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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