samples: net: echo_server: Do not bail out on Accept errors

Echo-server sample should not bail out on failed
accept() calls. This sample should close socket
in case of any errors and keep listening on socket
for further incoming connections.

Signed-off-by: Ravi kumar Veeramally <[email protected]>

samples/net/sockets/echo_server/src/tcp.c

@@ -220,7 +220,7 @@ static int process_tcp(struct data *data)
 			&client_addr_len);
 	if (client < 0) {
 		LOG_ERR("%s accept error (%d)", data->proto, -errno);
-		return -errno;
+		return 0;
 	}
 
 	slot = get_free_slot(data);