small fix for prevention of process in uploader.js

[Ujjansh05]

Recent small fix

• Fix: prevent further processing when chunk stream is inactive.
• File changed: lib/uploader.js
• Change: added early return in Chunkable._write:

  if (!this.active) {
    done();
    return; // prevent further processing when the stream is inactive
  }

• Why: avoids double-callbacks or processing remaining data when the stream has been marked inactive.
• Risk: minimal — only affects the inactive path.
• Suggested test: verify done() is called exactly once when active is false.