random(6): Fix double-close

random(6): Fix double-close

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