qcacld-3.0: Remove debug node reference for dropped skb

In rx path replayed mcast packets are dropped and freed,
but debug node reference for dropped skb is not removed.
This is resulting in invalid tracking of allocated netbuf.

Remove debug node reference for dropped skb.

Change-Id: I1e36436dadaefb666c14af57c72876a70b887e88
CRs-Fixed: 1066770

core/hdd/src/wlan_hdd_tx_rx.c

@@ -969,7 +969,7 @@ QDF_STATUS hdd_rx_packet_cbk(void *context, qdf_nbuf_t rxBuf)
 		++pAdapter->hdd_stats.hddTxRxStats.rxDropped[cpu_index];
 		QDF_TRACE(QDF_MODULE_ID_HDD_DATA, QDF_TRACE_LEVEL_INFO,
 			"%s: Dropping multicast replay pkt", __func__);
-		kfree_skb(skb);
+		qdf_nbuf_free(skb);
 		return QDF_STATUS_SUCCESS;
 	}