libwebsockets

ss: server: make sure failures after adopt invalidate ss copy of wsi

For server, if the adoption of the incoming connection proceeds but then
fails early on, eg, tls alert due to hostname mismatch with cert, the
wsi close happens but it doesn't clean up the invalidated reference to
itself in the server ss object... if it became established, that's handled
by the ss protocol callback.

This patch helps the close path to understand there is a related ss object
and to clean up after itself.