[issue1283] PyBytes (buffer) .extend method needs to accept any iterable of ints

[Gregory P. Smith]

Gregory P. Smith added the comment:

"There is still another possible leak if the PyMem_Realloc
return NULL (i.e., the system is out of memory), but I don't think it
worth fixing."

Do it.  It looks easy: a Py_DECREF(it) before the return PyErr_NoMemory().

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