Remove sig_algs_heap_allocated=0 as it is always 0

Signed-off-by: Ben Taylor <ben.taylor@linaro.org>
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 39a9732..5f4d31c 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -1066,12 +1066,6 @@
         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;
 }