sk_X509_CRL_new_null
crls = sk_X509_CRL_new_null();
*sk = sk_X509_CRL_new_null();
if ((sk = sk_X509_CRL_new_null()) == NULL)
*pcrls = sk_X509_CRL_new_null();
if ((crl_stack = sk_X509_CRL_new_null()) == NULL)
if ((*crls = sk_X509_CRL_new_null()) == NULL)