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
---
src/conf/domain_addr.c | 3 ++-
.../qemuxml2argv-usb-bus-missing.xml | 22 ++++++++++++++++++++++
tests/qemuxml2argvtest.c | 3 +++
3 files changed, 27 insertions(+), 1 deletion(-)
create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-usb-bus-missing.xml