xbt_free(dir);
surf_file_to_parse = surf_fopen(file, "r");
- xbt_assert((surf_file_to_parse), "Unable to open \"%s\"\n", file);
+ xbt_assert(surf_file_to_parse != nullptr, "Unable to open '%s'\n", file);
surf_input_buffer = surf_parse__create_buffer(surf_file_to_parse, YY_BUF_SIZE);
surf_parse__switch_to_buffer(surf_input_buffer);
surf_parse_lineno = 1;