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>
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