Fix typo in parallel_emerge which was breaking updates.

parallel_emerge

 #!/usr/bin/python2.6
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Program to run emerge in parallel, for significant speedup.
 
 Usage:
  ./parallel_emerge [--board=BOARD] [--workon=PKGS] [--no-workon-deps]
                    [emerge args] package"
@@ skipping 1635 matching lines @@
   # Are we upgrading portage? If so, and there are more packages to merge,
   # schedule a restart of parallel_emerge to merge the rest. This ensures that
   # we pick up all updates to portage settings before merging any more
   # packages.
   portage_upgrade = False
   root = emerge.settings["ROOT"]
   final_db = emerge.depgraph._dynamic_config.mydbapi[root]
   if root == "/":
     for db_pkg in final_db.match_pkgs("sys-apps/portage"):
       portage_pkg = deps_graph.get(db_pkg.cpv)
-      if portage and len(deps_graph) > 1:
+      if portage_pkg and len(deps_graph) > 1:
+        portage_pkg["needs"].clear()
+        portage_pkg["provides"].clear()
         deps_graph = { str(db_pkg.cpv): portage_pkg }
         portage_upgrade = True
         if "--quiet" not in emerge.opts:
           print "Upgrading portage first, then restarting..."
 
   # Run the queued emerges.
   scheduler = EmergeQueue(deps_graph, emerge, deps.package_db, deps.show_output)
   scheduler.Run()
 
   # Update world.
@@ skipping 15 matching lines @@
   # If we already upgraded portage, we don't need to do so again. But we do
   # need to upgrade the rest of the packages. So we'll go ahead and do that.
   if portage_upgrade:
     args = sys.argv[1:] + ["--nomerge=sys-apps/portage"]
     os.execvp(os.path.realpath(sys.argv[0]), args)
 
   print "Done"
 
 if __name__ == "__main__":
   main()