net:cxgb3: fix incorrect work cancellation

In my last changes in commit 5e0b8928 I introduced a copy-paste bug,
leading to cancel twice qresume_task work for OFLD queue, and never the
one for CTRL queue. This patch cancels correctly both works.
Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb3/sge.c

@@ -3310,7 +3310,7 @@ void t3_sge_stop(struct adapter *adap)
 		struct sge_qset *qs = &adap->sge.qs[i];
 
 		cancel_work_sync(&qs->txq[TXQ_OFLD].qresume_task);
-		cancel_work_sync(&qs->txq[TXQ_OFLD].qresume_task);
+		cancel_work_sync(&qs->txq[TXQ_CTRL].qresume_task);
 	}
 }