Blocked revisions 76741 via svnmerge

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  r76741 | mark.dickinson | 2009-12-10 10:39:08 +0000 (Thu, 10 Dec 2009) | 14 lines

  Merged revisions 76740 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r76740 | mark.dickinson | 2009-12-10 10:36:32 +0000 (Thu, 10 Dec 2009) | 8 lines

    Replace the size check for PyMem_MALLOC and PyMem_REALLOC with an almost
    equivalent[*] check that doesn't produce compiler warnings about a 'x < 0'
    check on an unsigned type.

    [*] it's equivalent for inputs of type size_t or Py_ssize_t, or any smaller
    unsigned or signed integer type.
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