sparc64: Fix OOPS in psycho_pcierr_intr_other().
We no longer put the top-level PCI controller device into the
PCI layer device list. So pbm->pci_bus->self is always NULL.
Therefore, use direct PCI config space accesses to get at
the PCI controller's PCI_STATUS register.
Tested by Meelis Roos.
Signed-off-by: David S. Miller <davem@davemloft.net>
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