asus_acpi: fix a memory leak in asus_hotk_get_info()

In the case of no match ( hotk->model == END_MODEL ), model sholud be
kfreed before return AE_OK.

This patch includes below fixes:

1. adds a missing kfree(model) before return AE_OK.

2. asus_hotk_get_info should return int, thus return 0 instead of AE_OK.
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Cc: Corentin Chary <corentincj@iksaif.net>
Cc: Karol Kozimor <sziwan@users.sourceforge.net>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Len Brown <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

drivers/platform/x86/asus_acpi.c

@@ -1340,7 +1340,8 @@ static int asus_hotk_get_info(void)
 			return -ENODEV;
 		}
 		hotk->methods = &model_conf[hotk->model];
-		return AE_OK;
+		kfree(model);
+		return 0;
 	}
 	hotk->methods = &model_conf[hotk->model];
 	printk(KERN_NOTICE "  %s model detected, supported\n", string);
@@ -1374,7 +1375,7 @@ static int asus_hotk_get_info(void)
 
 	kfree(model);
 
-	return AE_OK;
+	return 0;
 }
 
 static int asus_hotk_check(void)