pseries/iommu: Restore_default_window does not use liobn parameter

The parameter is unused, and complicates a following fix. Just remove
it.
Signed-off-by: NNishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/platforms/pseries/iommu.c

@@ -884,7 +884,7 @@ static int create_ddw(struct pci_dev *dev, const u32 *ddw_avail,
 }
 
 static void restore_default_window(struct pci_dev *dev,
-				u32 ddw_restore_token, unsigned long liobn)
+					u32 ddw_restore_token)
 {
 	struct eeh_dev *edev;
 	u32 cfg_addr;
@@ -1100,7 +1100,7 @@ static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 
 out_restore_window:
 	if (ddw_restore_token)
-		restore_default_window(dev, ddw_restore_token, liobn);
+		restore_default_window(dev, ddw_restore_token);
 
 out_unlock:
 	mutex_unlock(&direct_window_init_mutex);