migration: Don't create decompression threads if not enabled

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>

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I removed the [HACK] part because previous patch just check that
compression pages are not received.
1 file changed