PCI: mvebu: Drop error data fabrication when config read fails

If config pci_ops.read() methods return failure, the PCI_OP_READ() and
PCI_USER_READ_CONFIG() wrappers use PCI_SET_ERROR_RESPONSE() to set the
data value, so there's no need to set it in the pci_ops.read() methods
themselves.

Drop the unnecessary data value fabrication when pci_ops.read() fails.

Link: https://lore.kernel.org/r/f30264b137b1282ffda34d336e8060bb13d60b98.1637243717.git.naveennaidu479@gmail.comSigned-off-by: Naveen Naidu <naveennaidu479@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/controller/pci-mvebu.c

@@ -653,20 +653,16 @@ static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
 	int ret;
 
 	port = mvebu_pcie_find_port(pcie, bus, devfn);
-	if (!port) {
-		*val = 0xffffffff;
+	if (!port)
 		return PCIBIOS_DEVICE_NOT_FOUND;
-	}
 
 	/* Access the emulated PCI-to-PCI bridge */
 	if (bus->number == 0)
 		return pci_bridge_emul_conf_read(&port->bridge, where,
 						 size, val);
 
-	if (!mvebu_pcie_link_up(port)) {
-		*val = 0xffffffff;
+	if (!mvebu_pcie_link_up(port))
 		return PCIBIOS_DEVICE_NOT_FOUND;
-	}
 
 	/* Access the real PCIe interface */
 	ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,