Merged revisions 55027 via svnmerge from

Merged revisions 55027 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk/Modules/_ctypes

........
  r55027 | thomas.heller | 2007-04-30 18:04:57 +0200 (Mo, 30 Apr 2007) | 8 lines

  When accessing the .value attribute of a c_wchar_p instance, and the
  instance does not point to a valid wchar_t zero-terminated string,
  raise a ValueError.  c_char_p does this already.

  The ValueError message now contains the correct pointer address.

  Will backport to release25-maint.
........