[Bug 210211] ifstat does not report correct bandwidth for wlan on iwn (maybe others)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210211

            Bug ID: 210211
           Summary: ifstat does not report correct bandwidth for wlan on
                    iwn (maybe others)
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dave at monnigdesign.co.nz

Steps to reproduce:

run ifstat with an iwn wireless interface, ping something, no usage appears.

Also this code in my own application doesn't work for the same reason (works on
10.3):

void get_if_bytes(char *if_name)
{
        struct ifaddrs *ifap, *ifa;

        getifaddrs(&ifap);
        for(ifa = ifap; ifa; ifa = ifa->ifa_next) {
                if(!strcmp(ifa->ifa_name, if_name))
                        break;
        }
        if(!ifa) return; // interface not found
        in_bytes = ((struct if_data *)ifa->ifa_data)->ifi_ibytes;
        out_bytes = ((struct if_data *)ifa->ifa_data)->ifi_obytes;
        freeifaddrs(ifap);
        return;
}

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