uio: uio_sercos3: use device-managed functions for simple allocs

This change converts the simple allocations [kzalloc()] to devm_kzalloc()
tying the life-time of these objects to the PCI device object.
It cleans up the error and exit path and bit, and does a minor correction
that -ENOMEM is returned (vs -ENODEV) in case the 'priv' object cannot be
allocated.

Signed-off-by: Alexandru Ardelean <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/uio/uio_sercos3.c

···
 	struct sercos3_priv *priv;
 	int i;
 
-	info = kzalloc(sizeof(struct uio_info), GFP_KERNEL);
+	info = devm_kzalloc(&dev->dev, sizeof(struct uio_info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
 
-	priv = kzalloc(sizeof(struct sercos3_priv), GFP_KERNEL);
+	priv = devm_kzalloc(&dev->dev, sizeof(struct sercos3_priv), GFP_KERNEL);
 	if (!priv)
-		goto out_free;
+		return -ENOMEM;
 
 	if (pci_enable_device(dev))
-		goto out_free_priv;
+		return -ENODEV;
 
 	if (pci_request_regions(dev, "sercos3"))
 		goto out_disable;
···
 	pci_release_regions(dev);
 out_disable:
 	pci_disable_device(dev);
-out_free_priv:
-	kfree(priv);
-out_free:
-	kfree(info);
 	return -ENODEV;
 }
 
···
 		if (info->mem[i].internal_addr)
 			iounmap(info->mem[i].internal_addr);
 	}
-	kfree(info->priv);
-	kfree(info);
 }
 
 static struct pci_device_id sercos3_pci_ids[] = {