PCI: Use devm_add_action_or_reset()

devm_add_action_or_reset() is a helper function which internally calls
devm_add_action(). If the devm_add_action() fails, it will execute the
action mentioned and return the error code.

Use devm_add_action_or_reset() to reduce source code size (avoid writing
the action twice) and reduce the likelihood of bugs.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Fuqian Huang <[e-mail]>
Signed-off-by: Bjorn Helgaas <[e-mail]>

drivers/pci/controller/pci-host-common.c

···
 		goto err_out;
 	}
 
-	err = devm_add_action(dev, gen_pci_unmap_cfg, cfg);
+	err = devm_add_action_or_reset(dev, gen_pci_unmap_cfg, cfg);
 	if (err) {
-		gen_pci_unmap_cfg(cfg);
 		goto err_out;
 	}
 	return cfg;