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libgnutls: Fixed "no_renegotiation" alert handling at incorrect timing. The server sending a "no_renegotiation" alert in an unexpected timing, followed by an invalid second handshake was able to cause a TLS 1.3 client to crash via a null-pointer dereference. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure (#1071). [GNUTLS-SA-2020-09-04, CVSS: medium] https://lists.gnupg.org/pipermail/gnutls-help/2020-September/004669.html Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>