net.js: don't pretend that everything is okay when unwrapping fails
net.js: don't pretend that everything is okay when unwrapping fails

In case of an UNWRAP failure, the binding returns -1, which is truthy.

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node