Fix usb master startport parsing
When all usb controllers connected to the same bus have <master startport='x'/> specified, none of them have 'id=usb' assigned and thus qemu fails due to invalid masterport specification (we use 'usb' for that purpose). Adding a check that at least one of the controllers is specified without <master startport='x'/> and in case this happens, error out due to invalid configuration.
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