Re: [PATCH 1/3] version: refactor strbuf_sanitize()

> The git_user_agent_sanitized() function performs some sanitizing to
> avoid special characters being sent over the line and possibly messing
> up with the protocol or with the parsing on the other side.
>
> Let's extract this sanitizing into a new strbuf_sanitize() function, as
> we will want to reuse it in a following patch.
>
> For now the new strbuf_sanitize() function is still static as it's only
> needed locally.
>
> While at it, let's also make a few small improvements:
>   - use 'size_t' for 'i' instead of 'int',
>   - move the declaration of 'i' inside the 'for ( ... )',
>   - use strbuf_detach() to explicitely detach the string contained by
>     the 'buf' strbuf.