gnutls_hex_encode inconsistency

[John Brooks]

Just a quick little bug here - gnutls_hex_encode, according to the
documentation (and convention), will copy the output size to size_t
*result_size, but does not actually do so. This leaves no way (other than
manually doing the math) to get the exact output size of this function.
Threw me off a little when I had a couple hundred bytes of garbage
afterwards :P

Thanks,
  - John Brooks
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