Revert "git-codereview: work around compiler bug"

The compiler bug (golang/go#9738) has been fixed by CL 3690.

This reverts commit 18314f7ef99b73828d56cef081ee5a9572fe902c.

Change-Id: I313f19a57f74301841746d45437b945e3b0fc768
Reviewed-on: https://go-review.googlesource.com/3930
Reviewed-by: Russ Cox <rsc@golang.org>
diff --git a/git-codereview/util_test.go b/git-codereview/util_test.go
index 380609f..939590f 100644
--- a/git-codereview/util_test.go
+++ b/git-codereview/util_test.go
@@ -152,13 +152,12 @@
 		t.Fatal(err)
 	}
 
-	gt = &gitTest{
+	return &gitTest{
 		pwd:    pwd,
 		tmpdir: tmpdir,
 		server: server,
 		client: client,
 	}
-	return gt
 }
 
 func (gt *gitTest) removeStubHooks() {