s390x/pci: fixup trap_msix()

The function trap_msix() is to check if pcistg instruction would access
msix table entries. The correct boundary condition should be
[table_offset, table_offset+entries*entry_size). But the current
condition calculated misses the last entry. So let's fixup it.
Acked-by: NDong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Reviewed-by: NPierre Morel <pmorel@linux.vnet.ibm.com>
Signed-off-by: NYi Min Zhao <zyimin@linux.vnet.ibm.com>
Message-Id: <1503907487-2764-2-git-send-email-zyimin@linux.vnet.ibm.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: NCornelia Huck <cohuck@redhat.com>

hw/s390x/s390-pci-inst.c

@@ -440,8 +440,8 @@ static int trap_msix(S390PCIBusDevice *pbdev, uint64_t offset, uint8_t pcias)
 {
     if (pbdev->msix.available && pbdev->msix.table_bar == pcias &&
         offset >= pbdev->msix.table_offset &&
-        offset <= pbdev->msix.table_offset +
-                  (pbdev->msix.entries - 1) * PCI_MSIX_ENTRY_SIZE) {
+        offset < (pbdev->msix.table_offset +
+                  pbdev->msix.entries * PCI_MSIX_ENTRY_SIZE)) {
         return 1;
     } else {
         return 0;