migration/ram: Factor out check for advised postcopy

Let's factor out this check, to be used in virtio-mem context next.

While at it, fix a spelling error in a related comment.

Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>S
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
3 files changed