test: Skip if no enwik9

Author: klauspost

zstd/snappy_test.go

@@ -251,7 +251,8 @@ func BenchmarkSnappy_ConvertXML(b *testing.B) {
 func BenchmarkSnappy_Enwik9(b *testing.B) {
 	f, err := os.Open("testdata/enwik9.zst")
 	if err != nil {
-		b.Fatal(err)
+		b.Skip(err)
+		return
 	}
 	dec, err := NewReader(f)
 	if err != nil {