This is needed, otherwise ntfsimage outputs libntfs messages in debug
mode if stdout specified thus confusing e.g. compressing tools reading
from pipe. E.g. 'ntfsimage -o - device | bzip2 ...' creates a
corrupted, unusable ntfs image.
I've looked through libntfs and apparently no other places with this
problem.
Szaka
(Logical change 1.132)