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In some high-end Azure instances (e.g. NC6) we may receive an unsolicited VMBUS_OFFER_CHANNEL message for a PCIe pass-through device some time after completing the bus enumeration. This currently causes apparently random failures due to unexpected VMBus message types. Fix by ignoring any unsolicited VMBus messages. Signed-off-by: Michael Brown <mcb30@ipxe.org>