qemu: do not crash on USB address with no port and invalid bus
Properly error out when the user requests a port from a bus that does not have a controller present in the domain XML. https://bugzilla.redhat.com/show_bug.cgi?id=1441589
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Properly error out when the user requests a port from a bus that does not have a controller present in the domain XML. https://bugzilla.redhat.com/show_bug.cgi?id=1441589