ACPI: dock: fix build warning

drivers/acpi/dock.c:689: warning: too many arguments for format

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index 336d94c..2c2f28d 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -636,7 +636,7 @@
 	dock_device.name = dock_device_name;
 	ret = platform_device_register(&dock_device);
 	if (ret) {
-		printk(KERN_ERR PREFIX "Error registering dock device\n", ret);
+		printk(KERN_ERR PREFIX "Error %d registering dock device\n", ret);
 		kfree(dock_station);
 		return ret;
 	}