USB: asus_oled.c: remove err() usage

err() was a very old USB-specific macro that I thought had
gone away. This patch removes it from being used in the
driver and uses dev_err() instead.

CC: Jakub Schmidtke <[e-mail]>
CC: Pekka Paalanen <[e-mail]>
CC: Peter Huewe <[e-mail]>
CC: "Ken O'Brien" <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/asus_oled/asus_oled.c

···
 	oled_class = class_create(THIS_MODULE, ASUS_OLED_UNDERSCORE_NAME);
 
 	if (IS_ERR(oled_class)) {
-		err("Error creating " ASUS_OLED_UNDERSCORE_NAME " class");
+		printk(KERN_ERR "Error creating " ASUS_OLED_UNDERSCORE_NAME " class\n");
 		return PTR_ERR(oled_class);
 	}
 
 	retval = class_create_file(oled_class, &class_attr_version.attr);
 	if (retval) {
-		err("Error creating class version file");
+		printk(KERN_ERR "Error creating class version file\n");
 		goto error;
 	}
 
 	retval = usb_register(&oled_driver);
 
 	if (retval) {
-		err("usb_register failed. Error number %d", retval);
+		printk(KERN_ERR "usb_register failed. Error number %d\n", retval);
 		goto error;
 	}