sunhme: Return an ERR_PTR from quattro_pci_find

In order to differentiate between a missing bridge and an OOM condition,
return ERR_PTRs from quattro_pci_find. This also does some general linting
in the area.
Signed-off-by: Sean Anderson <seanga2@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/sun/sunhme.c

@@ -2498,18 +2498,16 @@ static struct quattro *quattro_sbus_find(struct platform_device *child)
 		return qp;
 
 	qp = kmalloc(sizeof(struct quattro), GFP_KERNEL);
-	if (qp != NULL) {
-		int i;
+	if (!qp)
+		return NULL;
 
-		for (i = 0; i < 4; i++)
-			qp->happy_meals[i] = NULL;
+	memset(qp->happy_meals, 0, sizeof(*qp->happy_meals));
 
 	qp->quattro_dev = child;
 	qp->next = qfe_sbus_list;
 	qfe_sbus_list = qp;
 
 	platform_set_drvdata(op, qp);
-	}
 	return qp;
 }
 
@@ -2569,19 +2567,23 @@ static void quattro_sbus_free_irqs(void)
 #ifdef CONFIG_PCI
 static struct quattro *quattro_pci_find(struct pci_dev *pdev)
 {
+	int i;
 	struct pci_dev *bdev = pdev->bus->self;
 	struct quattro *qp;
 
-	if (!bdev) return NULL;
+	if (!bdev)
+		return ERR_PTR(-ENODEV);
+
 	for (qp = qfe_pci_list; qp != NULL; qp = qp->next) {
 		struct pci_dev *qpdev = qp->quattro_dev;
 
 		if (qpdev == bdev)
 			return qp;
 	}
+
 	qp = kmalloc(sizeof(struct quattro), GFP_KERNEL);
-	if (qp != NULL) {
-		int i;
+	if (!qp)
+		return ERR_PTR(-ENOMEM);
 
 	for (i = 0; i < 4; i++)
 		qp->happy_meals[i] = NULL;
@@ -2592,7 +2594,6 @@ static struct quattro *quattro_pci_find(struct pci_dev *pdev)
 
 	/* No range tricks necessary on PCI. */
 	qp->nranges = 0;
-	}
 	return qp;
 }
 #endif /* CONFIG_PCI */
@@ -2948,11 +2949,15 @@ static int happy_meal_pci_probe(struct pci_dev *pdev,
 
 	if (!strcmp(prom_name, "SUNW,qfe") || !strcmp(prom_name, "qfe")) {
 		qp = quattro_pci_find(pdev);
-		if (qp == NULL)
+		if (IS_ERR(qp)) {
+			err = PTR_ERR(qp);
 			goto err_out;
+		}
+
 		for (qfe_slot = 0; qfe_slot < 4; qfe_slot++)
-			if (qp->happy_meals[qfe_slot] == NULL)
+			if (!qp->happy_meals[qfe_slot])
 				break;
+
 		if (qfe_slot == 4)
 			goto err_out;
 	}