mwifiex: fix empty TX ring check for PCIe8897 while unloading driver

While unloading driver, we free all pending TX packets by flushing
TX ring. There is unhandled case for PCIE8897 while checking for
ring empty condition.

This patch adds the handling by calling mwifiex_pcie_txbd_empty().
Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/mwifiex/pcie.c

@@ -1023,10 +1023,7 @@ static int mwifiex_pcie_send_data_complete(struct mwifiex_adapter *adapter)
 		adapter->data_sent = false;
 
 	if (card->txbd_flush) {
-		if (((card->txbd_wrptr & reg->tx_mask) ==
-		     (card->txbd_rdptr & reg->tx_mask)) &&
-		    ((card->txbd_wrptr & reg->tx_rollover_ind) !=
-		     (card->txbd_rdptr & reg->tx_rollover_ind)))
+		if (mwifiex_pcie_txbd_empty(card, card->txbd_rdptr))
 			card->txbd_flush = 0;
 		else
 			mwifiex_clean_pcie_ring_buf(adapter);