encoding/xml: fix format in test message

Found by go vet.

LGTM=crawshaw
R=golang-codereviews, crawshaw
CC=golang-codereviews
https://golang.org/cl/100510044

diff --git a/src/pkg/encoding/xml/marshal_test.go b/src/pkg/encoding/xml/marshal_test.go
index 638158397b8e48721273b4ec1d5fee8161450ca3..14f73a75d5fbd8f381461537b45177102d36b724 100644 (file)
--- a/src/pkg/encoding/xml/marshal_test.go
+++ b/src/pkg/encoding/xml/marshal_test.go
@@ -1260,7 +1260,7 @@ func TestDecodeEncode(t *testing.T) {
        for tok, err := dec.Token(); err == nil; tok, err = dec.Token() {
                err = enc.EncodeToken(tok)
                if err != nil {
-                       t.Fatalf("enc.EncodeToken: Unable to encode token (%#v), %d", tok, err)
+                       t.Fatalf("enc.EncodeToken: Unable to encode token (%#v), %v", tok, err)
                }
        }
 }