Merge branch 'jn/git-cmd-h-bypass-setup'

* jn/git-cmd-h-bypass-setup: update-index -h: show usage even with corrupt index merge -h: show usage even with corrupt index ls-files -h: show usage even with corrupt index gc -h: show usage even with broken configuration commit/status -h: show usage even with broken configuration checkout-index -h: show usage even in an invalid repository branch -h: show usage even in an invalid repository Conflicts: builtin/merge.c