[PATCH] Fix crash on big-endian systems during scan

The original code was doing arithmetics on a little-endian value.
Reported by Stelios Koroneos <stelios@stelioscellar.com>

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>