[3.6] bpo-32827: Fix usage of _PyUnicodeWriter_Prepare() in decoding errors handler. (GH-5636)#5651

miss-islington wants to merge 1 commit intopython:3.6python/cpython:3.6from

miss-islington:backport-b7e2d67-3.6miss-islington/cpython:backport-b7e2d67-3.6Copy head branch name to clipboard