PCI: of_property: Return error for int_map allocation failure

Return -ENOMEM from of_pci_prop_intr_map() if kcalloc() fails to prevent a
NULL pointer dereference in this case.

Fixes: 407d1a5 ("PCI: Create device tree node for bridge")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Duoming Zhou <[email protected]>
[bhelgaas: commit log]
Signed-off-by: Bjorn Helgaas <[email protected]>

Author: stonezdm

drivers/pci/of_property.c

@@ -238,6 +238,8 @@ static int of_pci_prop_intr_map(struct pci_dev *pdev, struct of_changeset *ocs,
 		return 0;
 
 	int_map = kcalloc(map_sz, sizeof(u32), GFP_KERNEL);
+	if (!int_map)
+		return -ENOMEM;
 	mapp = int_map;
 
 	list_for_each_entry(child, &pdev->subordinate->devices, bus_list) {