cxl: Fix an error message

'rc' is known to be 0 here.
Initialize 'rc' with the expected error code before using it.

While at it, avoid the affectation of 'rc' in a 'if' to make things more
obvious and linux style.

Fixes: f204e0b ("cxl: Driver code for powernv PCIe based cards for userspace access")
Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/fa2b2c9c72335ab4c3d5e6a33415e7f020b1d51b.1620243401.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/cxl/file.c

@@ -569,16 +569,17 @@ static int cxl_add_chardev(struct cxl_afu *afu, dev_t devt, struct cdev *cdev,
 	int rc;
 
 	cdev_init(cdev, fops);
-	if ((rc = cdev_add(cdev, devt, 1))) {
+	rc = cdev_add(cdev, devt, 1);
+	if (rc) {
 		dev_err(&afu->dev, "Unable to add %s chardev: %i\n", desc, rc);
 		return rc;
 	}
 
 	dev = device_create(cxl_class, &afu->dev, devt, afu,
 			"afu%i.%i%s", afu->adapter->adapter_num, afu->slice, postfix);
 	if (IS_ERR(dev)) {
-		dev_err(&afu->dev, "Unable to create %s chardev in sysfs: %i\n", desc, rc);
 		rc = PTR_ERR(dev);
+		dev_err(&afu->dev, "Unable to create %s chardev in sysfs: %i\n", desc, rc);
 		goto err;
 	}