PCI: pnv_php: Use kmemdup()

Use kmemdup() rather than duplicating its implementation.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>

drivers/pci/hotplug/pnv_php.c

@@ -275,14 +275,13 @@ static int pnv_php_add_devtree(struct pnv_php_slot *php_slot)
 		goto free_fdt1;
 	}
 
-	fdt = kzalloc(fdt_totalsize(fdt1), GFP_KERNEL);
+	fdt = kmemdup(fdt1, fdt_totalsize(fdt1), GFP_KERNEL);
 	if (!fdt) {
 		ret = -ENOMEM;
 		goto free_fdt1;
 	}
 
 	/* Unflatten device tree blob */
-	memcpy(fdt, fdt1, fdt_totalsize(fdt1));
 	dt = of_fdt_unflatten_tree(fdt, php_slot->dn, NULL);
 	if (!dt) {
 		ret = -EINVAL;