Cset 4 of zio-loop returns a combined control and data stream to
/dev/zio-loop-4-r-ctrldata . The same will soon happen with
PF_ZIO sockets, so add "-c" to zio-dump to support combined
mode (i.e. control is followed by data).
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Acked-by: Federico Vaga <federico.vaga@gmail.com>