[3.5] bpo-30769: Fix reference leak introduced in 7770394 (GH-2416)#2447

vstinner merged 1 commit intopython:3.5python/cpython:3.5from

emilyemorehouse:backport-a7874c7-3.5emilyemorehouse/cpython:backport-a7874c7-3.5Copy head branch name to clipboard