MIPS: TXx9: Use PCI_SET_ERROR_RESPONSE()

Instead of literal, PCI error value should be set with
PCI_SET_ERROR_RESPONSE(). Use it in tx4927_pci_config_read().
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Sergio Paracuellos <sergio.paracuellos@gmal.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/pci/ops-tx4927.c

@@ -144,7 +144,7 @@ static int tx4927_pci_config_read(struct pci_bus *bus, unsigned int devfn,
 
 	ret = mkaddr(bus, devfn, where, pcicptr);
 	if (ret != PCIBIOS_SUCCESSFUL) {
-		*val = 0xffffffff;
+		PCI_SET_ERROR_RESPONSE(val);
 		return ret;
 	}
 	switch (size) {