message: utils/lz4: fix some typo.
diff: @@ -15,7 +15,7 @@ pub(super) fn lz4_compress(src: &[u8]) -> Result<Vec<u8>> {
  }
  let mut dst_buf = Vec::with_capacity(compress_bound as usize);
  - let dec_size = unsafe {
  + let cmp_size = unsafe {
  LZ4_compress_default(
  src.as_ptr() as *const c_char,
  dst_buf.as_mut_ptr() as *mut c_char,
  @@ -23,12 +23,12 @@ pub(super) fn lz4_compress(src: &[u8]) -> Result<Vec<u8>> {
  compress_bound,
  )
  };
  - if dec_size <= 0 {
  - return Err(eio!("decompression failed"));
  + if cmp_size <= 0 {
  + return Err(eio!("compression failed"));
  }
  - assert!(dec_size as usize <= dst_buf.capacity());
  - unsafe { dst_buf.set_len(dec_size as usize) };
  + assert!(cmp_size as usize <= dst_buf.capacity());
  + unsafe { dst_buf.set_len(cmp_size as usize) };
  Ok(dst_buf)
  }
  