find_issuer
static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x,
xtmp = find_issuer(ctx, sktmp, x, 0);
xtmp = find_issuer(ctx, sktmp, x, 1);
*issuer = find_issuer(ctx, ctx->other_ctx, x, 1);