Fix socket status reading

[vinc]

Fix bug introduced in #567 preventing socket status reading, leading to an early closing of a connection.

If we use netcat in the host system to listen to a port:

$ nc -l 1234

Then we can connect to it from MOROS:

> socket 10.0.2.2:1234

And then if we write something in one console, we should see it in the other. But with the bug the connection would close after a second instead.