[neovim] Fix error in finally block when callback failed
[neovim] Fix error in finally block when callback failed

e.g. Opening another buffer when `set nohidden`

https://github.com/junegunn/fzf.vim/issues/77

qiemem/fzf,qiemem/fzf,junegunn/fzf,janlazo/fzf,tomfitzhenry/pkg-fzf,infokiller/fzf,me-and/fzf,janlazo/fzf,wilywampa/fzf,me-and/fzf,infokiller/fzf,tomfitzhenry/pkg-fzf,mjwestcott/fzf,noscript/fzf,infokiller/fzf,tomfitzhenry/pkg-fzf,lululau/fzf,mjwestcott/fzf,qiemem/fzf,junegunn/fzf,stuha/wbr-zsh,noscript/fzf,me-and/fzf,wilywampa/fzf,lululau/fzf,lululau/fzf,noscript/fzf,janlazo/fzf,wilywampa/fzf,mjwestcott/fzf,junegunn/fzf