simplify

Change-Id: I82e0c6e883a89af46fff9955b72c79b295816561

Author: mateusz834

src/encoding/hex/hex_test.go

@@ -278,8 +278,6 @@ func BenchmarkDecode(b *testing.B) {
 func BenchmarkDecodeString(b *testing.B) {
 	for _, size := range []int{256, 1024, 4096, 16384} {
 		src := strings.Repeat("2b744faa", size/8)
-		sink = make([]byte, size/2)
-
 		b.Run(fmt.Sprintf("%v", size), func(b *testing.B) {
 			b.SetBytes(int64(size))
 			for i := 0; i < b.N; i++ {