PCI: Simplify pci_pio_to_address()

Simplify pci_pio_to_address() by removing an unnecessary local variable.
No functional change intended.

Link: https://lore.kernel.org/r/20230824193712.542167-8-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Author: bjorn-helgaas

drivers/pci/pci.c

@@ -4191,16 +4191,12 @@ int pci_register_io_range(struct fwnode_handle *fwnode, phys_addr_t addr,
 
 phys_addr_t pci_pio_to_address(unsigned long pio)
 {
-	phys_addr_t address = (phys_addr_t)OF_BAD_ADDR;
-
 #ifdef PCI_IOBASE
-	if (pio >= MMIO_UPPER_LIMIT)
-		return address;
-
-	address = logic_pio_to_hwaddr(pio);
+	if (pio < MMIO_UPPER_LIMIT)
+		return logic_pio_to_hwaddr(pio);
 #endif
 
-	return address;
+	return (phys_addr_t) OF_BAD_ADDR;
 }
 EXPORT_SYMBOL_GPL(pci_pio_to_address);