SSL.read computes max and never uses it

[SeanTAllen]

SSL.read computes max and nothing reads it:

    let max = if expect > 0 then expect - offset else USize.max_value() end

It is at ssl/net/ssl.pony:201, the only mention of the name in the file.

Removing it changes nothing. Where expect > 0, len already holds expect - offset and len.min(pending) caps the read at that value. Where expect == 0, max is USize.max_value() and caps nothing.