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
Merge pull request #1195 from Shougo/vim-patch-7.4.379

vim-patch:7.4.379