allow_early_data_cb
ctx->allow_early_data_cb = cb;
sc->allow_early_data_cb = cb;
s->allow_early_data_cb = ctx->allow_early_data_cb;
SSL_allow_early_data_cb_fn allow_early_data_cb;
SSL_allow_early_data_cb_fn allow_early_data_cb;
|| (s->allow_early_data_cb != NULL
&& !s->allow_early_data_cb(SSL_CONNECTION_GET_USER_SSL(s),
SSL_CTX_set_allow_early_data_cb(sctx, allow_early_data_cb, &usecb);