review: Fix error of git change on windows

git change doesn't pass @{u} correctly on windows.
The runtime of msys2/cygwin runtime treat @{u] as @u on cmd.exe.
This is a workaround for avoiding mis-converting.

Fixes golang/go#15036

Change-Id: Ia0389108af69a8b8987ccba1ed933d0767f8efa7
Reviewed-on: https://go-review.googlesource.com/21018
Reviewed-by: Russ Cox <rsc@golang.org>
1 file changed