neovim/neovim — pull request #1685 by justinmk (2014-12-16 07:51:50+00:00)
Title: [RFC] coverity/74718: os_call_shell: handle null `cmd`

- remove invalid `FUNC_ATTR_NONNULL_ARG(1)`
- receive `(char *)` internally
- modify identifier names for consistency
- edit comments for concision and consistency