ssl_helpers.c: unify code format between source file and header file

Signed-off-by: Yanray Wang <yanray.wang@arm.com>
diff --git a/tests/include/test/ssl_helpers.h b/tests/include/test/ssl_helpers.h
index b38c58a..281d1f5 100644
--- a/tests/include/test/ssl_helpers.h
+++ b/tests/include/test/ssl_helpers.h
@@ -345,7 +345,8 @@
 int mbedtls_test_message_socket_setup(
     mbedtls_test_ssl_message_queue *queue_input,
     mbedtls_test_ssl_message_queue *queue_output,
-    size_t queue_capacity, mbedtls_test_mock_socket *socket,
+    size_t queue_capacity,
+    mbedtls_test_mock_socket *socket,
     mbedtls_test_message_socket_context *ctx);
 
 /*