Fix copypasta

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 0ca0270..c0c1101 100644
--- a/tests/include/test/ssl_helpers.h
+++ b/tests/include/test/ssl_helpers.h
@@ -482,7 +482,7 @@
  *                       &server.ssl, &client.ssl,
  *                       MBEDTLS_SSL_HANDSHAKE_OVER);
  * mbedtls_test_move_handshake_to_state(
- *                       &client.ssl, &client.ssl,
+ *                       &client.ssl, &server.ssl,
  *                       MBEDTLS_SSL_HANDSHAKE_OVER);
  * ```
  * Note that you need both calls to reach the handshake-over state on