fs/FilteredSocket: don't call BufferedSocket::Reinit() with filter
fs/FilteredSocket: don't call BufferedSocket::Reinit() with filter

When a filter is used, BufferedSocket::expect_more can be true, which
triggers a bogus assertion failure in BufferedSocket::Reinit().  We
don't need Reinit() in this case, we only need to reset the timeouts.

CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy,CM4all/beng-proxy