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: 7628	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/7628/0e479449fef93e4c83986ffd3cf186fa0672ecd8/nsPostUpdateWin.js/buggy/src/nsPostUpdateWin.js