vim-patch:7.4.379

Problem:    Accessing freed memory after using setqflist(list, 'r'). (Lcd)
Solution:   Reset qf_index.

https://code.google.com/p/vim/source/detail?r=v7-4-379

src/nvim/quickfix.c

@@ -1890,6 +1890,7 @@ static void qf_free(qf_info_T *qi, int idx)
   }
   free(qi->qf_lists[idx].qf_title);
   qi->qf_lists[idx].qf_title = NULL;
+  qi->qf_lists[idx].qf_index = 0;
 }
 
 /*