check_trust
trtmp->check_trust = ck;
return pt->check_trust(pt, x, flags);
trust = check_trust(ctx, num);
trust = check_trust(ctx, num);
static int check_trust(X509_STORE_CTX *ctx, int num_untrusted);
int (*check_trust)(struct x509_trust_st *, X509 *, int);