decoder-event: BUG_ON on table mismatches

Abort when the event enum and the name<>event table are not matching.

src/decode.c

@@ -430,6 +430,7 @@ void DecodeRegisterPerfCounters(DecodeThreadVars *dtv, ThreadVars *tv)
 
     int i = 0;
     for (i = 0; i < DECODE_EVENT_PACKET_MAX; i++) {
+        BUG_ON(i != (int)DEvents[i].code);
         dtv->counter_invalid_events[i] = StatsRegisterCounter(
                 DEvents[i].event_name, tv);
     }