http: fix duplicate var initialization

IncomingMessage function contained duplicate initialization
of this._pendings. Line with one of those expressions has been
removed.

lib/http.js

@@ -289,7 +289,6 @@ function IncomingMessage(socket) {
   // XXX This implementation is kind of all over the place
   // When the parser emits body chunks, they go in this list.
   // _read() pulls them out, and when it finds EOF, it ends.
-  this._pendings = [];
 
   this.socket = socket;
   this.connection = socket;