Fix format issues

google/jwt_test.go

@@ -139,7 +139,7 @@ func TestJWTAccessTokenSourceWithScope(t *testing.T) {
 }
 
 func setupDummyKey(t *testing.T) {
-	once.Do(func () {
+	once.Do(func() {
 		// Generate a key we can use in the test data.
 		pk, err := rsa.GenerateKey(rand.Reader, 2048)
 		if err != nil {