[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 60b1d7967ef8 by Victor Stinner in branch 'default':
Issue #18408: Fix create_extra() of _elementtree.c, raise MemoryError on memory
http://hg.python.org/cpython/rev/60b1d7967ef8

New changeset 1e0afd558ba3 by Victor Stinner in branch 'default':
Issue #18408: Fix constructors of _elementtree.c
http://hg.python.org/cpython/rev/1e0afd558ba3

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