Linux ioctl emulation

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

I'm getting a panic in compat_ifioctl() in if_43.c when a linux binary
makes an ioctl(fd, SIOCGIFBRDADDR, &data ) call.

In this code at the end of the function oifr is NULL.

        if (cmd != ocmd)
                ifreqn2o(oifr, ifr);

Robert Swindells