fix_itertools_imports.py fails on a "*" import

2to3 fails on this code:
   from itertools import *

with a traceback:
  File "/home/david/coding/python-svn/trunk-2to3-issues/Lib/lib2to3/tests/test_fixers.py", line 3680, in test_star
    self.warns_unchanged(s, "Cannot handle star imports")
  File "/home/david/coding/python-svn/trunk-2to3-issues/Lib/lib2to3/tests/test_fixers.py", line 49, in warns_unchanged
    self.warns(before, before, message, unchanged=True)
  File "/home/david/coding/python-svn/trunk-2to3-issues/Lib/lib2to3/tests/test_fixers.py", line 43, in warns
    tree = self._check(before, after)
  File "/home/david/coding/python-svn/trunk-2to3-issues/Lib/lib2to3/tests/test_fixers.py", line 32, in _check
    tree = self.refactor.refactor_string(before, self.filename)
  File "/home/david/coding/python-svn/trunk-2to3-issues/Lib/lib2to3/refactor.py", line 359, in refactor_string
    self.refactor_tree(tree, name)
  File "/home/david/coding/python-svn/trunk-2to3-issues/Lib/lib2to3/refactor.py", line 393, in refactor_tree
    self.traverse_by(self.post_order_heads, tree.post_order())
  File "/home/david/coding/python-svn/trunk-2to3-issues/Lib/lib2to3/refactor.py", line 417, in traverse_by
    new = fixer.transform(node, results)
  File "/home/david/coding/python-svn/trunk-2to3-issues/Lib/lib2to3/fixes/fix_itertools_imports.py", line 24, in transform
    assert child.type == syms.import_as_name
AssertionError

(seen when running 2to3 on python-lxml ; see problem in downstream tracker: https://bugzilla.redhat.com/show_bug.cgi?id=600036 )