migration: Improve migration thread error handling
We now report errors also when we finish migration, not only on info migrate. We plan to use this error from several places, and we want the first error to happen to win, so we add an mutex to order it. Signed-off-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
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