rem: if (this._outputStream) { this._outputStream.close(); this._outputStream = null; } 
add: if (!this._outputStream) return; this._outputStream.close(); this._outputStream = null; 
context:   end: function() {    if (this._outputStream) {      this._outputStream.close();      this._outputStream = null;    }  }
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/77a545c6d7a63f393074d49d0850f3fedb0bc5fa/nsPostUpdateWin.js/buggy/toolkit/mozapps/update/src/nsPostUpdateWin.js