s390-pci: fix compilation on older GCC versions

S390PCIBusDevice is typedef'ed earlier in the file, before the hunks
that this patch modifies.  The double typedef causes old versions of
GCC to complain.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <1485523252-88288-1-git-send-email-pbonzini@redhat.com>
Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com>

hw/s390x/s390-pci-bus.h

@@ -279,7 +279,7 @@ typedef struct S390PCIIOMMUTable {
     S390PCIIOMMU *iommu[PCI_SLOT_MAX];
 } S390PCIIOMMUTable;
 
-typedef struct S390PCIBusDevice {
+struct S390PCIBusDevice {
     DeviceState qdev;
     PCIDevice *pdev;
     ZpciState state;
@@ -301,7 +301,7 @@ typedef struct S390PCIBusDevice {
     IndAddr *indicator;
     QEMUTimer *release_timer;
     QTAILQ_ENTRY(S390PCIBusDevice) link;
-} S390PCIBusDevice;
+};
 
 typedef struct S390PCIBus {
     BusState qbus;