Crash with nested $param variables

[liviuchircu]

Present in OpenSIPS 1.9+.

route [route_b]
{
    # Evaluating $param(1) leads to infinite recursion!
    xlog("This should not crash: $param(1)\n");
}

route [route_a]
{
    route(route_b, $param(1));
}

route
{
    route(route_a, "test");
    ...
}