From: Lou Langholtz <ldl@aros.net>

This fifth patch cleans up usage of the PARANOIA sanity checking macro and
code.  This patch modifies both drivers/block/nbd.c and
include/linux/nbd.h.  It's intended to be applied incrementally on top of
my fourth patch (4.1 really if you count the memset addition as .1's worth)
that simply removed unneeded blksize_bits field.  Again, I wanted to get
this smaller change out of the way before my next patch will is much more
major.