image/gif: fix nil deref in test

LGTM=crawshaw, dave
R=golang-codereviews, crawshaw, dave
CC=golang-codereviews
https://golang.org/cl/104520044

diff --git a/src/pkg/image/gif/writer_test.go b/src/pkg/image/gif/writer_test.go
index c1ada769c2c40b4ba2a6ec1a5104d49d31a97a4f..bc5d37845b630c941e9c49a3264e9f3962c969d8 100644 (file)
--- a/src/pkg/image/gif/writer_test.go
+++ b/src/pkg/image/gif/writer_test.go
@@ -116,7 +116,7 @@ func TestEncodeAll(t *testing.T) {
        for i, f := range frames {
                m, err := readGIF(f)
                if err != nil {
-                       t.Error(f, err)
+                       t.Fatal(f, err)
                }
                g0.Image[i] = m.Image[0]
        }