unetmsg: remove redundant socket close

channel.disconnect() already closes the fd via ubus_shutdown(),
so calling socket.close() afterwards is redundant and causes EBADF.

Signed-off-by: Felix Fietkau <nbd@nbd.name>
(cherry picked from commit bdc3c1a820)

package/network/services/unetmsg/files/usr/share/ucode/unetmsg/unetmsgd-remote.uc

@@ -44,7 +44,6 @@ function network_socket_close(data)
 	if (data.timer)
 		data.timer.cancel();
 	data.channel.disconnect();
-	data.socket.close();
 }
 
 function network_rx_cleanup_state(name)