net: use mut and refs as receivers consistently (#8205)

vlib/x/websocket/io.v

@@ -86,7 +86,7 @@ fn (mut ws Client) shutdown_socket() ? {
 }
 
 // dial_socket connects tcp socket and initializes default configurations
-fn (mut ws Client) dial_socket() ?net.TcpConn {
+fn (mut ws Client) dial_socket() ?&net.TcpConn {
 	tcp_address := '$ws.uri.hostname:$ws.uri.port'
 	mut t := net.dial_tcp(tcp_address) ?
 	optval := int(1)

vlib/x/websocket/websocket_client.v

@@ -30,7 +30,7 @@ pub:
 	uri    Uri    // uri of current connection
 	id     string // unique id of client
 pub mut:
-	conn              net.TcpConn // underlying TCP socket connection
+	conn              &net.TcpConn // underlying TCP socket connection
 	nonce_size        int = 16 // size of nounce used for masking
 	panic_on_callback bool     // set to true of callbacks can panic
 	state             State    // current state of connection
@@ -75,6 +75,7 @@ pub enum OPCode {
 pub fn new_client(address string) ?&Client {
 	uri := parse_uri(address) ?
 	return &Client{
+		conn: 0
 		is_server: false
 		ssl_conn: openssl.new_ssl_conn()
 		is_ssl: address.starts_with('wss')

vlib/x/websocket/websocket_server.v

@@ -9,8 +9,8 @@ import rand
 // Server represents a websocket server connection
 pub struct Server {
 mut:
-	logger                  &log.Log              // logger used to log
-	ls                      net.TcpListener       // listener used to get incoming connection to socket
+	logger                  &log.Log // logger used to log
+	ls                      &net.TcpListener      // listener used to get incoming connection to socket
 	accept_client_callbacks []AcceptClientFn      // accept client callback functions
 	message_callbacks       []MessageEventHandler // new message callback functions
 	close_callbacks         []CloseEventHandler   // close message callback functions
@@ -36,6 +36,7 @@ pub mut:
 // new_server instance a new websocket server on provided port and route
 pub fn new_server(port int, route string) &Server {
 	return &Server{
+		ls: 0
 		port: port
 		logger: &log.Log{
 			level: .info