git-codereview: fix TestCurrentBranch

Fixes #9379

Change-Id: Ia9122464574355c01e6c457087b0eef9375826e2
Reviewed-on: https://go-review.googlesource.com/1772
Reviewed-by: Chris Manghane <cmang@golang.org>
diff --git a/git-codereview/branch_test.go b/git-codereview/branch_test.go
index 10949fe..2358b94 100644
--- a/git-codereview/branch_test.go
+++ b/git-codereview/branch_test.go
@@ -14,7 +14,7 @@
 	checkCurrentBranch(t, "master", "origin/master", false, false, "", "")
 
 	t.Logf("on newbranch")
-	trun(t, gt.client, "git", "checkout", "-b", "newbranch")
+	trun(t, gt.client, "git", "checkout", "-t", "-b", "newbranch", "origin/master")
 	checkCurrentBranch(t, "newbranch", "origin/master", true, false, "", "")
 
 	t.Logf("making change")