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cbeda2012a
When we fall back to using our own loaded image's device handle (instead of the most recently opened SNP device handle), we may find that the device handle is no longer valid since we have disconnected the driver that originally provided it. Check for existence of the device path protocol on the identified parent handle, and choose not to attempt to set a parent-child relationship if the parent handle appears to no longer be valid. Signed-off-by: Michael Brown <mcb30@ipxe.org>