hw/core/bus.c: Only the main system bus can have no parent
In commit 80376c3f in 2010 we added a workaround for some qbus buses not being connected to qdev devices -- if the bus has no parent object then we register a reset function which resets the bus on system reset (and unregister it when the bus is unparented). Nearly a decade later, we have now no buses in the tree which are created with non-NULL parents, so we can remove the workaround and instead just assert that if the bus has a NULL parent then it is the main system bus. (The absence of other parentless buses was confirmed by code inspection of all the callsites of qbus_create() and qbus_create_inplace() and cross-checked by 'make check'.) Signed-off-by: NPeter Maydell <peter.maydell@linaro.org> Reviewed-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: NDamien Hedde <damien.hedde@greensocs.com> Tested-by: NPhilippe Mathieu-Daudé <philmd@redhat.com> Message-id: 20190523150543.22676-1-peter.maydell@linaro.org
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