Set error if EVP_CipherUpdate fails.

Reviewed-by: NRich Salz <rsalz@openssl.org>

crypto/evp/bio_enc.c

@@ -163,6 +163,7 @@ static int enc_read(BIO *b, char *out, int outl)
                                   (unsigned char *)&(ctx->buf[BUF_OFFSET]),
                                   i)) {
                 BIO_clear_retry_flags(b);
+                ctx->ok = 0;
                 return 0;
             }
             ctx->cont = 1;