We typically batch unmaps to be lazily flushed out at
regular intervals.  When we destroy a domain, we need
to force a flush of these lazy unmaps to be sure none
reference the domain we're about to free.

Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=35062Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>
Cc: stable@kernel.org