[issue3668] "s*" argument parser marker leaks memory

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

This patch elegantly reuses the existing cleanup list.

Only two remarks: 
- there are a few tabs/spaces inconsistencies.
- I would make the cleanup_ptr explicit:
intead of 
      addcleanup(*buffer, freelist, NULL);
I'd prefer
      addcleanup(*buffer, freelist, cleanup_ptr);

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<http://bugs.python.org/issue3668>
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