ext/spl: use zend_object_alloc to create SplObjectStorage instances. (#17824)

Author: devnexen

ext/spl/spl_observer.c

@@ -257,8 +257,7 @@ static zend_object *spl_object_storage_new_ex(zend_class_entry *class_type, zend
 	spl_SplObjectStorage *intern;
 	zend_class_entry *parent = class_type;
 
-	intern = emalloc(sizeof(spl_SplObjectStorage) + zend_object_properties_size(parent));
-	memset(intern, 0, sizeof(spl_SplObjectStorage) - sizeof(zval));
+	intern = zend_object_alloc(sizeof(spl_SplObjectStorage), parent);
 	intern->pos = 0;
 
 	zend_object_std_init(&intern->std, class_type);