patch 8.1.2149: crash when running out of memory very early Commit: https://github.com/vim/vim/commit/e3a22cb1ba057381be3e645479a537f8032f119f Author: Bram Moolenaar <Bram@vim.org> Date: Mon Oct 14 22:01:57 2019 +0200 patch 8.1.2149: crash when running out of memory very early Problem: Crash when running out of memory very early. Solution: Do not use IObuff when it's NULL. (closes https://github.com/vim/vim/issues/5052)