Remove sig_algs_heap_allocated=0 as it is always 0

Signed-off-by: Ben Taylor <ben.taylor@linaro.org>

library/ssl_tls.c

@@ -1066,12 +1066,6 @@ static int ssl_handshake_init(mbedtls_ssl_context *ssl)
         mbedtls_ssl_set_timer(ssl, 0);
     }
 #endif
-
-#if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED)
-#if !defined(MBEDTLS_DEPRECATED_REMOVED)
-    ssl->handshake->sig_algs_heap_allocated = 0;
-#endif /* !MBEDTLS_DEPRECATED_REMOVED */
-#endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */
     return 0;
 }