PCI: mvebu: Use existing of_node pointer

Use the existing "np" pointer instead of looking up dev->of_node again.  No
functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/host/pci-mvebu.c

@@ -1228,14 +1228,14 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	num = of_get_available_child_count(dev->of_node);
+	num = of_get_available_child_count(np);
 
 	pcie->ports = devm_kcalloc(dev, num, sizeof(*pcie->ports), GFP_KERNEL);
 	if (!pcie->ports)
 		return -ENOMEM;
 
 	i = 0;
-	for_each_available_child_of_node(dev->of_node, child) {
+	for_each_available_child_of_node(np, child) {
 		struct mvebu_pcie_port *port = &pcie->ports[i];
 
 		ret = mvebu_pcie_parse_port(pcie, port, child);