- Fix coverity issue 49: ce might be forwarded as NULL without an exception

being thrown in case the Zend API is being used wrong (in custom exts for
  instance).

Zend/zend_interfaces.c

@@ -292,18 +292,23 @@ static zend_object_iterator *zend_user_it_get_iterator(zend_class_entry *ce, zva
 /* {{{ zend_user_it_get_new_iterator */
 ZEND_API zend_object_iterator *zend_user_it_get_new_iterator(zend_class_entry *ce, zval *object, int by_ref TSRMLS_DC)
 {
-	zval *iterator = zend_user_it_new_iterator(ce, object TSRMLS_CC);
+	zval *iterator;
 	zend_object_iterator *new_iterator;
 
+	if (!ce) {
+		zend_error(E_ERROR, "Cannot create iterator without knowing the class type");
+		return NULL;
+	}
+
+	iterator = zend_user_it_new_iterator(ce, object TSRMLS_CC);
+
 	zend_class_entry *ce_it = iterator && Z_TYPE_P(iterator) == IS_OBJECT ? Z_OBJCE_P(iterator) : NULL;
 
-	if (!ce || !ce_it || !ce_it->get_iterator || (ce_it->get_iterator == zend_user_it_get_new_iterator && iterator == object)) {
-		if (!EG(exception))
-		{
+	if (!ce_it || !ce_it->get_iterator || (ce_it->get_iterator == zend_user_it_get_new_iterator && iterator == object)) {
+		if (!EG(exception)) {
 			zend_throw_exception_ex(NULL, 0 TSRMLS_CC, "Objects returned by %v::getIterator() must be traversable or implement interface Iterator", ce->name);
 		}
-		if (iterator)
-		{
+		if (iterator) {
 			zval_ptr_dtor(&iterator);
 		}
 		return NULL;