semaphore: avoid loop variable capture by closure

Change-Id: I21c5dc48ffe43aa27c50a42f9c9a01ac1f0c747c
Reviewed-on: https://go-review.googlesource.com/40991
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Glenn Lewis <gmlewis@google.com>
1 file changed