sk_X509_pop_free(a->extra_certs,X509_free);
if (a->comp_methods != NULL)
sk_SSL_COMP_pop_free(a->comp_methods,SSL_COMP_free);
sk_X509_pop_free(a->extra_certs,X509_free);
if (a->comp_methods != NULL)
sk_SSL_COMP_pop_free(a->comp_methods,SSL_COMP_free);