Fix an error code clash due to a merge
Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2665)
# define SSL_F_TLS_PROCESS_HELLO_RETRY_REQUEST 511
# define SSL_F_TLS_PROCESS_INITIAL_SERVER_FLIGHT 442
# define SSL_F_TLS_PROCESS_KEY_EXCHANGE 365
-# define SSL_F_TLS_PROCESS_KEY_UPDATE 513
+# define SSL_F_TLS_PROCESS_KEY_UPDATE 518
# define SSL_F_TLS_PROCESS_NEW_SESSION_TICKET 366
# define SSL_F_TLS_PROCESS_NEXT_PROTO 383
# define SSL_F_TLS_PROCESS_SERVER_CERTIFICATE 367