Merged revisions 80762 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

........
  r80762 | mark.dickinson | 2010-05-04 19:45:27 +0100 (Tue, 04 May 2010) | 3 lines

  Fix test_gzip failure on OS X.  The failure was a result of trying to fflush
  a file that wasn't open for writing.  Patch by Antoine Pitrou.
........