PCI: designware: Use NULL instead of false

of_get_address() expects pointers in the third and fourth parameters.

Pass NULL in order to fix the following sparse warnings:

  drivers/pci/host/pcie-designware.c:433:51: warning: Using plain integer as NULL pointer
  drivers/pci/host/pcie-designware.c:433:58: warning: Using plain integer as NULL pointer

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Lucas Stach <l.stach@pengutronix.de>
Acked-by: Jingoo Han <jg1.han@samsung.com>

drivers/pci/host/pcie-designware.c

@@ -430,7 +430,7 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
 
 		/* Find the untranslated configuration space address */
 		index = of_property_match_string(np, "reg-names", "config");
-		addrp = of_get_address(np, index, false, false);
+		addrp = of_get_address(np, index, NULL, NULL);
 		pp->cfg0_mod_base = of_read_number(addrp, ns);
 		pp->cfg1_mod_base = pp->cfg0_mod_base + pp->cfg0_size;
 	} else {