man page for gnutls_x509_crt_get_extension_info

[Sam Varshavchik]

Unlike other _get_() pages, the man page for this function does not 
explicitly state that if oid and sizeof_id are zeroes, sizeof_id gets filled 
in with the size of the buffer that needs to be allocated for the returned 
data.

But, a brief peek at the code does suggest that this is the case. Can this 
be clarified, in the man page?

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