message: Fix negation bug in librustzcash_sapling_check_output
diff: @@ -695,7 +695,7 @@ pub extern "system" fn librustzcash_sapling_check_output(
  // Accumulate the value commitment in the context
  {
  let mut tmp = cv.clone();
  - tmp.negate(); // Outputs subtract from the total.
  + tmp = tmp.negate(); // Outputs subtract from the total.
  tmp = tmp.add(&unsafe { &*ctx }.bvk, &JUBJUB);
  // Update the context
  