PCI: designware: Rename dw_pcie_valid_config() to dw_pcie_valid_device()

Rename dw_pcie_valid_config() to dw_pcie_valid_device() and use the result
directly as a boolean value instead of testing against 0.  No functional
change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 74da71e..b58f078 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -760,8 +760,8 @@
 	return ret;
 }
 
-static int dw_pcie_valid_config(struct pcie_port *pp,
-				struct pci_bus *bus, int dev)
+static int dw_pcie_valid_device(struct pcie_port *pp, struct pci_bus *bus,
+				int dev)
 {
 	/* If there is no link, then there is no device */
 	if (bus->number != pp->root_bus_nr) {
@@ -781,7 +781,7 @@
 {
 	struct pcie_port *pp = bus->sysdata;
 
-	if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
+	if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn))) {
 		*val = 0xffffffff;
 		return PCIBIOS_DEVICE_NOT_FOUND;
 	}
@@ -797,7 +797,7 @@
 {
 	struct pcie_port *pp = bus->sysdata;
 
-	if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
+	if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn)))
 		return PCIBIOS_DEVICE_NOT_FOUND;
 
 	if (bus->number == pp->root_bus_nr)