Comment 4 for bug 1166634

Looks like though the logic is quite a bit different here:
https://gitorious.org/gnutls/gnutls/commit/328ee22c1b3951e060c7124c7cb1cee592c59bc0

We have:
 for (i = 2; i <= pad; i++)

where upstream has:
 for (i = 2; i <= MIN(256, ciphertext->size); i++)