If the current sendmsg() lands on the same subflow we used last, we
can try to collapse the data.
Signed-off-by: NPaolo Abeni <pabeni@redhat.com>
Signed-off-by: NChristoph Paasch <cpaasch@apple.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>