mbedtls_test_ssl_perform_handshake: declare options as const

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/include/test/ssl_helpers.h b/tests/include/test/ssl_helpers.h
index c198bc3..7cff97c 100644
--- a/tests/include/test/ssl_helpers.h
+++ b/tests/include/test/ssl_helpers.h
@@ -457,7 +457,7 @@
  */
 int mbedtls_test_ssl_endpoint_init(
     mbedtls_test_ssl_endpoint *ep, int endpoint_type,
-    mbedtls_test_handshake_test_options *options,
+    const mbedtls_test_handshake_test_options *options,
     mbedtls_test_message_socket_context *dtls_context,
     mbedtls_test_ssl_message_queue *input_queue,
     mbedtls_test_ssl_message_queue *output_queue);
@@ -609,7 +609,7 @@
 
 #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED)
 void mbedtls_test_ssl_perform_handshake(
-    mbedtls_test_handshake_test_options *options);
+    const mbedtls_test_handshake_test_options *options);
 #endif /* MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED */
 
 #if defined(MBEDTLS_TEST_HOOKS)
diff --git a/tests/src/test_helpers/ssl_helpers.c b/tests/src/test_helpers/ssl_helpers.c
index ac1f1cb..0141fb4 100644
--- a/tests/src/test_helpers/ssl_helpers.c
+++ b/tests/src/test_helpers/ssl_helpers.c
@@ -736,7 +736,7 @@
 
 int mbedtls_test_ssl_endpoint_init(
     mbedtls_test_ssl_endpoint *ep, int endpoint_type,
-    mbedtls_test_handshake_test_options *options,
+    const mbedtls_test_handshake_test_options *options,
     mbedtls_test_message_socket_context *dtls_context,
     mbedtls_test_ssl_message_queue *input_queue,
     mbedtls_test_ssl_message_queue *output_queue)
@@ -2105,7 +2105,7 @@
 
 #if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED)
 void mbedtls_test_ssl_perform_handshake(
-    mbedtls_test_handshake_test_options *options)
+    const mbedtls_test_handshake_test_options *options)
 {
     enum { BUFFSIZE = 17000 };
     mbedtls_test_ssl_endpoint client, server;