review: git change doesn't pass @{u} correctly on windows.

Fixes golang/go#9377

Quote the branch name.

Change-Id: Ib35a5dcf7198b94331d894f3bcd825af64b1582d
Reviewed-on: https://go-review.googlesource.com/13600
Reviewed-by: Andrew Gerrand <adg@golang.org>
1 file changed