text/template: fix formatting calls in tests

Change-Id: I8e94fa57482149f6ea8f13d02ddcc82d6764ddb8
Reviewed-on: https://go-review.googlesource.com/15496Reviewed-by: Andrew Gerrand <adg@golang.org>

src/text/template/multi_test.go

@@ -277,10 +277,10 @@ func TestRedefinition(t *testing.T) {
 		t.Fatalf("parse 1: %v", err)
 	}
 	if _, err = tmpl.Parse(`{{define "test"}}bar{{end}}`); err != nil {
-		t.Fatal("got error %v, expected nil", err)
+		t.Fatalf("got error %v, expected nil", err)
 	}
 	if _, err = tmpl.New("tmpl2").Parse(`{{define "test"}}bar{{end}}`); err != nil {
-		t.Fatal("got error %v, expected nil", err)
+		t.Fatalf("got error %v, expected nil", err)
 	}
 }