[issue3660] reference leaks in 3.0

[Amaury Forgeot d'Arc]

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

Antoine, it seem that with encode-leak2.patch, the error path after
PyErr_WarnEx() leaks the value of "v".

I rewrote the whole paragraph to make it more straightforward:
- the normal case is tested first
- all paths end with a "return", and no goto.
- no need to test that PyBytes_FromStringAndSize returns a PyBytes...

I find the code much easier to check in this form, but of course this is
a subjective POV.

Added file: http://bugs.python.org/file11391/encode-leak3.patch

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