migration/rdma: Check for postcopy sooner

It makes no sense first try to see if there is an rdma error and then
do nothing on postcopy stage.  Change it so we check we are in
postcopy before doing anything.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20230504114443.23891-6-quintela@redhat.com>
1 file changed