kern: get ssl_session in the *SSL_get_session() order .

[cfc4n]

fixes: #187

SSL_SESSION *SSL_get_session(const SSL *ssl) from boringssl src/ssl/ssl_session.cc

SSL_SESSION *SSL_get_session(const SSL *ssl) {
  // Once the handshake completes we return the established session. Otherwise
  // we return the intermediate session, either |session| (for resumption) or
  // |new_session| if doing a full handshake.
  if (!SSL_in_init(ssl)) {
    return ssl->s3->established_session.get();
  }
  SSL_HANDSHAKE *hs = ssl->s3->hs.get();
  if (hs->early_session) {
    return hs->early_session.get();
  }
  if (hs->new_session) {
    return hs->new_session.get();
  }
  return ssl->session.get();
}

Signed-off-by: CFC4N cfc4n.cs@gmail.com