ide: tighten checks on PCI BARs in ide_hwif_configure()

Index: b/drivers/ide/setup-pci.c
===================================================================
@@ -319,18 +319,18 @@ static ide_hwif_t *ide_hwif_configure(st
 
 		ctl  = pci_resource_start(dev, 2*port+1);
 		base = pci_resource_start(dev, 2*port);
-		if ((ctl && !base) || (base && !ctl)) {
-			printk(KERN_ERR "%s: inconsistent baseregs (BIOS) "
-				"for port %d, skipping\n", d->name, port);
-			return NULL;
-		}
-	}
-	if (!ctl) {
+	} else {
 		/* Use default values */
 		ctl = port ? 0x374 : 0x3f4;
 		base = port ? 0x170 : 0x1f0;
 	}
 
+	if (!base || !ctl) {
+		printk(KERN_ERR "%s: bad PCI BARs for port %d, skipping\n",
+				d->name, port);
+		return NULL;
+	}
+
 	hwif = ide_find_port_slot(d);
 	if (hwif == NULL) {
 		printk(KERN_ERR "%s: too many IDE interfaces, no room in "