libvdsk/qcow: Refactor debug printf's to DPRINTF
libvdsk/qcow: Refactor debug printf's to DPRINTF

Signed-off-by: Sergiu Weisz <b42bd078c8ea13f67d4e745f62f35ca02deba66d@gmail.com>

xcllnt/libvdsk,xcllnt/libvdsk