[issue30961] Py_Decref a borrowed reference in _tracemalloc

[Xiang Zhang]

New submission from Xiang Zhang:


New changeset 4ed5ad79ec6c6270e6018bd0a55656305ee60907 by Xiang Zhang in branch 'master':
bpo-30961: Fix decrementing a borrowed reference in tracemalloc. (#2747)
https://github.com/python/cpython/commit/4ed5ad79ec6c6270e6018bd0a55656305ee60907


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<http://bugs.python.org/issue30961>
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