Fix src/list.c

src/list.c

@@ -259,7 +259,7 @@ RefcountList *refcount_list_join(RefcountList *list1, RefcountList *list2) {
     }
     if (list2) {
         if (list2->prev) {
-            list2->prev = NULL;
+            list2->prev->next = NULL;
         }
         list2->prev = end1;
     }