[WIP] Remove an unnecessary variable

Hi

Just looking through neovim sources again.

Again saw some weird code, thought I should sent a pull request. The code looks equivalent.
The point is to define the saved_finish_op inside a new block using `{` and `}` so that it is clear that no one else uses it : 

https://gist.github.com/simula67/f2ba063ae8815ef09592