PCI: endpoint: Improve pci_epf_type_add_cfs()

pci_epf_type_add_cfs() should not be called with an unbound EPF device,
that is, an epf device with epf->driver not set. For such case, replace the
NULL return in pci_epf_type_add_cfs() with a clear ERR_PTR(-ENODEV) pointer
error return.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Damien Le Moal <[email protected]>
Signed-off-by: Lorenzo Pieralisi <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Manivannan Sadhasivami <[email protected]>

Author: damien-lemoal

drivers/pci/endpoint/pci-ep-cfs.c

@@ -532,7 +532,7 @@ static struct config_group *pci_epf_type_add_cfs(struct pci_epf *epf,
 
 	if (!epf->driver) {
 		dev_err(&epf->dev, "epf device not bound to driver\n");
-		return NULL;
+		return ERR_PTR(-ENODEV);
 	}
 
 	if (!epf->driver->ops->add_cfs)