ofp-util: Add OFPUTIL_ACTION_INVALID to enum ofputil_action_code.

Possibly the ofputil_decode_action() interface should be rethought now
that ofputil_action_code has an invalid value.

Reviewed-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Ben Pfaff <blp@nicira.com>

lib/ofp-parse.c

@@ -323,6 +323,9 @@ parse_named_action(enum ofputil_action_code code, const struct flow *flow,
     struct ofp_action_tp_port *oata;
 
     switch (code) {
+    case OFPUTIL_ACTION_INVALID:
+        NOT_REACHED();
+
     case OFPUTIL_OFPAT10_OUTPUT:
         parse_output(b, arg);
         break;