Fix Decode benchmark, add samples properly

bench_test.go

@@ -36,9 +36,12 @@ func BenchmarkDecode(b *testing.B) {
 			b.Fatal(err)
 		}
 
-		data := make([]float32, 0, 64)
+		data := make([]float32, 128)
 		for {
 			if _, err := d.ReadFloat(data); err != nil {
+				if err == io.EOF {
+					break
+				}
 				b.Fatal(err)
 			}
 		}