Merge pull request #1924 from apjanke/fix-unused-param-warning

Fix unused-parameter warning in duk_push_class_string_tval

AUTHORS.rst

@@ -52,6 +52,7 @@ and agreed to irrevocably license their contributions under the Duktape
 * Christopher Hiller (https://github.com/boneskull)
 * Gonzalo Diethelm (https://github.com/gonzus)
 * Michal Kasperek (https://github.com/michalkas)
+* Andrew Janke (https://github.com/apjanke)
 
 Other contributions
 ===================

src-input/duk_api_stack.c

@@ -3287,6 +3287,8 @@ DUK_INTERNAL void duk_push_class_string_tval(duk_hthread *thr, duk_tval *tv, duk
 		}
 		duk_pop_unsafe(thr);
 	}
+#else
+	DUK_UNREF(avoid_side_effects);
 #endif
 
 	h_obj = duk_known_hobject(thr, -1);