dlm: move conversion to compile time

This patch is a cleanup to move the byte order conversion to compile
time. In a simple comparison like this it's possible to move it to
static values so the compiler will always convert those values at
compile time.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>