In the case where a file lacks a trailing newline, there is some "evil" code to
reverse goto the tokenizing code ("make_token") for the final token in the
file. In this case, 'fd' is closed more than once. Use a negative sentinel
value to guard close(2), preventing the double close.
Ideally, this code would be restructured to avoid this ugly construction.
Reported by: Coverity
CID: 1006123
Sponsored by: EMC / Isilon Storage Division