Adjust indent [ci skip]

error.c

@@ -2113,7 +2113,7 @@ name_err_mesg_to_str(VALUE obj)
             }
             else {
                 VALUE klass;
-object:
+              object:
                 klass = CLASS_OF(obj);
                 if (RB_TYPE_P(klass, T_CLASS) && FL_TEST(klass, FL_SINGLETON)) {
                     s = FAKE_CSTR(&s_str, "");