message: fix precedence of operation
diff: @@ -709,7 +709,7 @@ fn add_28_mul8_v1(x: &[u8], y: &[u8]) -> [u8; 32] {
  let mut acc = 0;
  let mut out = [0u8; 32];
  for i in 0..32 {
  - out[i] = (y[i] << 3) + acc & 0x8;
  + out[i] = (y[i] << 3) + (acc & 0x8);
  acc = y[i] >> 5;
  }
  Fe::from_bytes(&out)
  