powerpc/pseries/ddw: simplify enable_ddw()

This drops rather useless ddw_enabled flag as direct_mapping implies
it anyway.

While at this, fix indents in enable_ddw().

This should not cause any behavioral change.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211108040320.3857636-3-aik@ozlabs.ru

arch/powerpc/platforms/pseries/iommu.c

@@ -1229,7 +1229,6 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 	u32 ddw_avail[DDW_APPLICABLE_SIZE];
 	struct dma_win *window;
 	struct property *win64;
-	bool ddw_enabled = false;
 	struct failed_ddw_pdn *fpdn;
 	bool default_win_removed = false, direct_mapping = false;
 	bool pmem_present;
@@ -1244,7 +1243,6 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 
 	if (find_existing_ddw(pdn, &dev->dev.archdata.dma_offset, &len)) {
 		direct_mapping = (len >= max_ram_len);
-		ddw_enabled = true;
 		goto out_unlock;
 	}
 
@@ -1397,8 +1395,8 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 			dev_info(&dev->dev, "failed to map DMA window for %pOF: %d\n",
 				 dn, ret);
 
-		/* Make sure to clean DDW if any TCE was set*/
-		clean_dma_window(pdn, win64->value);
+			/* Make sure to clean DDW if any TCE was set*/
+			clean_dma_window(pdn, win64->value);
 			goto out_del_list;
 		}
 	} else {
@@ -1445,7 +1443,6 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 	spin_unlock(&dma_win_list_lock);
 
 	dev->dev.archdata.dma_offset = win_addr;
-	ddw_enabled = true;
 	goto out_unlock;
 
 out_del_list:
@@ -1481,10 +1478,10 @@ static bool enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 	 * as RAM, then we failed to create a window to cover persistent
 	 * memory and need to set the DMA limit.
 	 */
-	if (pmem_present && ddw_enabled && direct_mapping && len == max_ram_len)
+	if (pmem_present && direct_mapping && len == max_ram_len)
 		dev->dev.bus_dma_limit = dev->dev.archdata.dma_offset + (1ULL << len);
 
-    return ddw_enabled && direct_mapping;
+	return direct_mapping;
 }
 
 static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)