Fix typo in RecursiveIteratorIterator get_gc handler

Author: nikic

ext/spl/spl_iterators.c

@@ -928,7 +928,7 @@ static HashTable *spl_RecursiveIteratorIterator_get_gc(zend_object *obj, zval **
 	if (object->iterators) {
 		for (int level = 0; level <= object->level; level++) {
 			zend_get_gc_buffer_add_zval(gc_buffer, &object->iterators[level].zobject);
-			zend_get_gc_buffer_add_obj(gc_buffer, &object->iterators[object->level].iterator->std);
+			zend_get_gc_buffer_add_obj(gc_buffer, &object->iterators[level].iterator->std);
 		}
 	}
 

ext/spl/tests/bug65387.phpt

@@ -51,6 +51,12 @@ $it = new RecursiveArrayIterator([1, 2, 3]);
 $it2 = new RecursiveIteratorIterator($it);
 $it[] = $it2;
 
+// Recursive iterator at level>0.
+$it = new RecursiveArrayIterator([[1]]);
+$it2 = new RecursiveIteratorIterator($it);
+$it[] = $it2;
+$it2->next();
+
 ?>
 ===DONE===
 --EXPECT--