s390x/pci: assert zpci always existing
If one pci device is plugged successfully, there must be a zpci device existing. This means that during hot-unplugging a pci device, its corresponding zpci device must be found. Therefore we use an assert to replace current code. Signed-off-by: NYi Min Zhao <zyimin@linux.vnet.ibm.com> Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
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