don't load asus-acpi if model is not supported

asus_hotk_get_info should return -ENODEV if the model is not supported.
http://bugzilla.kernel.org/show_bug.cgi?id=10389

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/asus_acpi.c b/drivers/acpi/asus_acpi.c
index 91571fc..428e47b 100644
--- a/drivers/acpi/asus_acpi.c
+++ b/drivers/acpi/asus_acpi.c
@@ -1244,6 +1244,8 @@
 			       "default values\n", string);
 			printk(KERN_NOTICE
 			       "  send /proc/acpi/dsdt to the developers\n");
+			kfree(model);
+			return -ENODEV;
 		}
 		hotk->methods = &model_conf[hotk->model];
 		return AE_OK;