xen/xenbus-frontend: Make error message more clear

Add the work frontend to the error message because we now also have a
backend device.

Signed-off-by: Bastian Blank <waldi@debian.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

drivers/xen/xenbus/xenbus_dev_frontend.c

@@ -611,7 +611,7 @@ static int __init xenbus_init(void)
 
 	err = misc_register(&xenbus_dev);
 	if (err)
-		printk(KERN_ERR "Could not register xenbus device\n");
+		printk(KERN_ERR "Could not register xenbus frontend device\n");
 	return err;
 }