fix failed test:

fugitifduck · fugitifduck · commit fba78280e1f4 · 2014-08-12T16:44:36.000-07:00
typo error in size of actionHdr
diff --git a/lib/OpenFlow0x04.ml b/lib/OpenFlow0x04.ml
@@ -3909,7 +3909,7 @@ module ActionHdr = struct
       | PopPbbHdr
       | SetMplsTtlHdr
       | DecMplsTtlHdr
-      | SetQueueHdr
+      | SetQueueHdr -> 4
       | ExperimenterAHdr _ -> 8
 
   let to_string (act : t) =
