### Description

By using the WebSocket module we noticed that the memory on the server keeps increasing daily even if the number of registered devices is decreasing

### Troubleshooting

#### Reproduction

Connect to the server through the wss and then disable the network adapter.

#### Debugging Data

If the TCP connection is closed forcefully (tested by disabling network adapter) then the number of current wss connections is not decreasing:

``` kamcmd stats.get_statistics all | grep "ws_current_connections" ``` The same happens with the allocated shared memory: ``` kamcmd mod.stats all shm | grep 'wsconn_' ``` wsconn_add(198) - this value is not decreasing. Everything is working properly if the TCP connection is properly closed.

* **Operating System**:

``` CentOS 7 X64 3.10.0-1160.76.1.el7.x86_64 version: kamailio 5.6.1 (x86_64/linux) d8f98b ``` XHTTP Request Route:

``` event_route[xhttp:request] { set_reply_close(); set_reply_no_connect();

if (ws_handle_handshake()) { xlog("L_INFO", "[$cfg(route)] websocket|log|handled HTTP request $rm from $si:$sp\n"); exit; } } ```

TCP Settings: ``` tcp_connection_lifetime=3605 tcp_accept_no_cl=yes tcp_rd_buf_size=16384 tcp_connect_timeout=10 tcp_crlf_ping=yes tcp_delayed_ack = yes tcp_fd_cache = yes tcp_keepalive = yes tcp_keepcnt = 3 tcp_keepidle = 30 tcp_keepintvl = 10 tcp_accept_aliases=no tcp_async=yes tcp_linger2=30 tcp_max_connections=4096 tcp_send_timeout = 10 ```