Add additionalProperties=false

Change-Id: Iaec16b61ae8ec24c2013a310bf6a8d3a10e1f571
Signed-off-by: Ed Tanous <etanous@nvidia.com>
diff --git a/specification/json/sections/cper-generic-dmar.json b/specification/json/sections/cper-generic-dmar.json
index 2075b3b..0a121c9 100644
--- a/specification/json/sections/cper-generic-dmar.json
+++ b/specification/json/sections/cper-generic-dmar.json
@@ -24,6 +24,7 @@
         "faultReason": {
             "type": "object",
             "required": ["value", "name"],
+            "additionalProperties": false,
             "properties": {
                 "value": {
                     "type": "integer"