add launchpad bug reports without comments

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+PXB selected as root bus incorrectly
+
+release: 4c41341af76cfc85b5a6c0f87de4838672ab9f89
+
+qdev_device_add() will search for the "closest" bus possible, and bail out early if that bus is a root bus. pxb devices are considered root buses and so if you either
+1. Add a PCI device on the QEMU command line *after* a pxb device, or
+2. Add an integrated PCI device (like a watchdog)
+
+#1: -device pxb-pcie,id=cxl.0,bus=pcie.0,bus_nr=52 -device ahci,id=sata0,addr=0x8
+#2: -watchdog i6300esb -device pxb-pcie,id=cxl.0,bus=pcie.0,bus_nr=52
+
+The PXB will get selected as the bus (instead of the real root bus) and this will cause an assertion failure with the message like "qemu-system-x86_64: -device ahci,id=sata0,addr=0x8: PCI: Only PCI/PCIe bridges can be plugged into pxb-pcie"
+
+I think this is relatively solvable in the code base by determining if a bus is an expander, and skipping it if so. However, I wonder if it makes more sense to just allow expanders to have endpoint devices.
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