Simplify freeing of function attributes

Use `zend_hash_release()`.

Author: TimWolla

Zend/zend_opcode.c

@@ -152,12 +152,7 @@ ZEND_API void zend_function_dtor(zval *zv)
 		ZEND_ASSERT(function->type == ZEND_INTERNAL_FUNCTION);
 		ZEND_ASSERT(function->common.function_name);
 		zend_string_release_ex(function->common.function_name, 1);
-
-		if (function->common.attributes) {
-			zend_hash_destroy(function->common.attributes);
-			free(function->common.attributes);
-			function->common.attributes = NULL;
-		}
+		zend_hash_release(function->common.attributes);
 
 		/* For methods this will be called explicitly. */
 		if (!function->common.scope) {