Use correct variable in thirdpartyresourcedata codec.

Fixes #34459

pkg/registry/extensions/thirdpartyresourcedata/codec.go

@@ -418,7 +418,7 @@ func (t *thirdPartyResourceDataDecoder) Decode(data []byte, gvk *unversioned.Gro
 			return nil, nil, fmt.Errorf("unexpected object for 'kind': %v", kindObj)
 		}
 		if len(t.kind) > 0 && kindStr != t.kind {
-			return nil, nil, fmt.Errorf("kind doesn't match, expecting: %s, got %s", gvk.Kind, kindStr)
+			return nil, nil, fmt.Errorf("kind doesn't match, expecting: %s, got %s", t.kind, kindStr)
 		}
 		actual.Kind = kindStr
 	}

pkg/registry/extensions/thirdpartyresourcedata/codec_test.go

@@ -80,6 +80,15 @@ func TestCodec(t *testing.T) {
 			},
 			name: "basic",
 		},
+		{
+			into: &extensions.ThirdPartyResourceData{},
+			obj: &Foo{
+				ObjectMeta: api.ObjectMeta{Name: "bar"},
+				TypeMeta:   unversioned.TypeMeta{Kind: "ThirdPartyResourceData"},
+			},
+			expectErr: true,
+			name:      "broken kind",
+		},
 		{
 			obj: &Foo{
 				ObjectMeta: api.ObjectMeta{Name: "bar", ResourceVersion: "baz"},