conf: Fix crash in virDomainDefCompatibleDevice
Commit id 'edae027c' blindly assumed that the passed @oldDev parameter would not be NULL when calling virDomainDeviceGetInfo; however, commit id 'b6a264e8' passed NULL for AttachDevice callers under the premise that there wouldn't be a device to check/update against. Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
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