patch 8.1.0821: xxd "usage" output and other arguments not tested commit https://github.com/vim/vim/commit/970f5d39f27717b1a529b7b250a8ed7c3f791949 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jan 25 21:52:17 2019 +0100 patch 8.1.0821: xxd "usage" output and other arguments not tested Problem: Xxd "usage" output and other arguments not tested. Solution: Add a test to trigger the usage output in various ways. Fix uncovered problem.

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