fix error

Author: aldehir

common/chat.cpp

@@ -1380,7 +1380,7 @@ static void common_chat_parse_gpt_oss(common_chat_msg_parser & builder) {
             builder.add_tool_call(name, "", args);
         } else if (builder.try_consume_regex(builtin_tool_call_regex)) {
             builder.consume_rest();
-            LOG_ERR("builtin tool calls not implemented");
+            LOG_ERR("builtin tool calls not implemented\n");
         } else {
             throw common_chat_msg_parse_exception("expected function call, got: " + consume_until_start());
         }