GH364: Free memory on an error path

Part of RT 3997
Per Ben, just jump to common exit code.

Signed-off-by: Rich Salz <rsalz@akamai.com>
Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit cc2829e)

crypto/x509/x509_vfy.c

@@ -354,7 +354,8 @@ int X509_verify_cert(X509_STORE_CTX *ctx)
             if (!sk_X509_push(ctx->chain, x)) {
                 X509_free(xtmp);
                 X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
-                return 0;
+                ok = 0;
+                goto done;
             }
             num++;
         }