#20 http vfs doesn't clean up tokens

[Neil Madden]

The http vfs implementation leaks http sessions.

Firstly, in vfs::http::Mount, there is a line:

set token [http::geturl $dirurl -validate 1]

There doesn't seem to be a reason for this to be there, as it's
result is never checked, and $token is not referenced ever again.

Leak number 2 is in vfs::http::open, where the url is retrieved with
http::geturl and then copied into a memchan. This is missing a
http::cleanup after the copy has been done.

[Vince Darley]

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Could you attach a patch to fix these problems, since you've
diagnosed them so well?

[Jeffrey Hobbs]

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I've rewritten vfs::http for 1.3.1.