migration: No need to return the size of the cache
After the previous commits, we make sure that the value passed is right, or we just drop an error. So now we return if there is one error or we have setup correctly the value passed. Signed-off-by: NJuan Quintela <quintela@redhat.com> Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com> -- Improve error messasge Return 0 always for success
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