drm/xe/configfs: Fix pci_dev reference leak

We are using pci_get_domain_bus_and_slot() function to verify if
the given config directory name matches any existing PCI device,
but we missed to call matching pci_dev_put() to release reference.

While around, also change error code in case of no device match,
to make it more specific than generic formatting error.

Fixes: 16280de ("drm/xe: Add configfs to enable survivability mode")
Signed-off-by: Michal Wajdeczko <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Reviewed-by: Lucas De Marchi <[email protected]>
Reviewed-by: Jonathan Cavitt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lucas De Marchi <[email protected]>
(cherry picked from commit 0bdd05c2a82bbf2419415d012fd4f5faeca7f1af)
Signed-off-by: Rodrigo Vivi <[email protected]>

Author: mwajdecz

drivers/gpu/drm/xe/xe_configfs.c

@@ -267,7 +267,8 @@ static struct config_group *xe_config_make_device_group(struct config_group *gro
 
 	pdev = pci_get_domain_bus_and_slot(domain, bus, PCI_DEVFN(slot, function));
 	if (!pdev)
-		return ERR_PTR(-EINVAL);
+		return ERR_PTR(-ENODEV);
+	pci_dev_put(pdev);
 
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (!dev)