message: nydus-image: blob uncompressed size is wrongly calcualted
  The `uncompressed_offset` is the next position to to write
  chunk to uncompressed blob cache. It is already increased
  before adding blob size.
diff: @@ -474,8 +474,7 @@ impl Node {
  blob_ctx.uncompressed_offset += aligned_chunk_size as u64;
  blob_ctx.compressed_blob_size += compressed_size as u64;
  - blob_ctx.uncompressed_blob_size =
  - blob_ctx.uncompressed_offset + aligned_chunk_size as u64;
  + blob_ctx.uncompressed_blob_size = pre_uncompressed_offset + aligned_chunk_size as u64;
  blob_ctx.blob_hash.update(&compressed);
  // Dump compressed chunk data to blob
  