subflow: introduce and use mptcp_can_accept_new_subflow()

So that we can easily perform some basic PM-related
adimission checks before creating the child socket.

Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Tested-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed