Update examples/sock_tcp_echo/main.c

Co-authored-by: Marian Buschsieweke <maribu@users.noreply.github.com>

examples/sock_tcp_echo/main.c

@@ -147,7 +147,7 @@ static int _cmd_tcp_listen(int argc, char **argv)
 }
 
 static const shell_command_t shell_commands[] = {
-    { "send", "send data over TCP", _cmd_tcp_send },
+SHELL_COMMAND(send, "send data over TCP", _cmd_tcp_send);
     { "listen", "start echo server", _cmd_tcp_listen },
     { NULL, NULL, NULL }
 };