Fix memory leak when converting a dict to python
Fix memory leak when converting a dict to python

PyDict_SetItem doesn't take ownership, unlike it's list equivalent :-/

Fix #1384, that's an old leak, thanks a lot to @m-romanov!

pombredanne/pythran,pombredanne/pythran,serge-sans-paille/pythran,serge-sans-paille/pythran,pombredanne/pythran