mwifiex: fix memory leak in mwifiex_send_processed_packet()

Memory is leaked after downloading already processed packet. This
patch fixes the problem by freeing returned skb. Other transmit
paths don't have this problem.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Cathy Luo <cluo@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
index ffffd2c..ef717ac 100644
--- a/drivers/net/wireless/mwifiex/wmm.c
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -1228,6 +1228,9 @@
 	case -EINPROGRESS:
 		if (adapter->iface_type != MWIFIEX_PCIE)
 			adapter->data_sent = false;
+		break;
+	case 0:
+		mwifiex_write_data_complete(adapter, skb, 0, ret);
 	default:
 		break;
 	}