Read socket state in g_socket_get_local/remote_address

Previously we saved the location in various places which is unnecessary
and sometimes even wrong. For instance, we saved the address we bound to
which may not have the final port set.

gio/tests/socket-server.c

@@ -191,6 +191,7 @@ main (int argc,
 
       g_print ("got a new connection from %s\n",
 	       socket_address_to_string (address));
+      g_object_unref (address);
 
       recv_socket = new_socket;
     }