Fix array out of bound panic introduced in r306219.

As I see, different NICs in different configurations may have different
numbers of TX and RX queues.  The code was assuming 1:1 mapping between
event queues (interrupts) and TX/RX queues.  Since number of interrupts
is set to maximum of TX and RX queues, when those two are different, the
system is doomed.

I have no documentation or deep knowledge about this hardware, so this
change is based on general observations and code reading.  If some of my
guesses are wrong, please do better.  I just confirmed HP NC550SFP NICs
are working now.

MFC after:	2 weeks
Sponsored by:	iXsystems, Inc.

sys/dev/oce/oce_if.c

@@ -2394,10 +2394,20 @@ oce_eqd_set_periodic(POCE_SOFTC sc)
 			goto modify_eqd;
 		}
 
-		rq = sc->rq[i];
-		rxpkts = rq->rx_stats.rx_pkts;
-		wq = sc->wq[i];
-		tx_reqs = wq->tx_stats.tx_reqs;
+		if (i == 0) {
+			rq = sc->rq[0];
+			rxpkts = rq->rx_stats.rx_pkts;
+		} else
+			rxpkts = 0;
+		if (i + 1 < sc->nrqs) {
+			rq = sc->rq[i + 1];
+			rxpkts += rq->rx_stats.rx_pkts;
+		}
+		if (i < sc->nwqs) {
+			wq = sc->wq[i];
+			tx_reqs = wq->tx_stats.tx_reqs;
+		} else
+			tx_reqs = 0;
 		now = ticks;
 
 		if (!aic->ticks || now < aic->ticks ||