patch 8.1.0890: pty allocation wrong if using file for out channel commit https://github.com/vim/vim/commit/593864817a08f9b719a093ef4fd8d4d35132ab86 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Feb 10 22:43:46 2019 +0100 patch 8.1.0890: pty allocation wrong if using file for out channel Problem: Pty allocation wrong if using file for out channel and using null for in channel and null for error channel. Solution: Correct using use_file_for_out in condition. (Ozaki Kiichi, closes #3917)

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