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sys should always be set (but lets assert if not), buf == NULL
should not be called from VLC as well. And the return value was
kind of wrong.

errSSLClosedGraceful does not seem to be a valid return code
for this function.

This is no warning, but normal behaviour.

This module uses the string passed by --http-cert to search
the server certificate in the OSX keychain. The corresponding
private key is selected automatically.

Secure Transport is a TLS library part of the Security framework
(preinstalled on every iOS and MacOS device). This library does
certificate validation during handshake automatically using the
root certificates from the preinstalled certificate store.

The main reason for this module is proper certificate validation
on iOS devices. This is not possible with gnutls, because there is
no access to the root certificates for external applications.
The module is also intended for use on OSX.