fix a syntax error

main_test.go

@@ -655,6 +655,7 @@ func httpPost(t *testing.T, url string, headers map[string]string, reqBody []byt
 func assertNginxResponseBuffering(t *testing.T, expected string, resp *http.Response, msgAndArgs ...interface{}) {
 	actual := resp.Header.Get(helper.NginxResponseBufferHeader)
 	assert.Equal(t, expected, actual, msgAndArgs...)
+}
 
 // sha1(data) as human-readable string
 func sha1s(data []byte) string {