Minor changes to stabilize the PULL path.
Minor changes to stabilize the PULL path.

We revert the timeout to the default one, add some extra BUG() calls (to make
sure we only get the xen path in this specific module) and disable releasing the
region after a pull request has been sent.

ananos/xen2mx,ananos/xen2mx,ananos/xen2mx,ananos/xen2mx