d2i_xxx出错

在生成DER编码是X509_ALGOR类型没有赋值导致，要先new,然后赋值。

req_st->req.appKeyReq->appKeyType = X509_ALGOR_new();
X509_ALGOR_set0(req_st->req.appKeyReq->appKeyType, OBJ_nid2obj(NID_sm2sign_with_sm3), V_ASN1_NULL, NULL);