rpmsg: cleanup incorrect function in dev_err message

Trivial cleanup for incorrect function in dev_err message
Signed-off-by: Henri Roosen <henri.roosen@ginzinger.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/rpmsg/rpmsg_char.c

@@ -390,7 +390,7 @@ static int rpmsg_eptdev_create(struct rpmsg_ctrldev *ctrldev,
 
 	ret = device_add(dev);
 	if (ret) {
-		dev_err(dev, "device_register failed: %d\n", ret);
+		dev_err(dev, "device_add failed: %d\n", ret);
 		put_device(dev);
 	}
 
@@ -505,7 +505,7 @@ static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev)
 
 	ret = device_add(dev);
 	if (ret) {
-		dev_err(&rpdev->dev, "device_register failed: %d\n", ret);
+		dev_err(&rpdev->dev, "device_add failed: %d\n", ret);
 		put_device(dev);
 	}