wl12xx: move ba fields into wlvif

move ba_fields into the per-interface data, rather than
being global.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
diff --git a/drivers/net/wireless/wl12xx/tx.c b/drivers/net/wireless/wl12xx/tx.c
index 509ae10..6ce6163 100644
--- a/drivers/net/wireless/wl12xx/tx.c
+++ b/drivers/net/wireless/wl12xx/tx.c
@@ -941,7 +941,7 @@
 			}
 		}
 
-		wl->ba_rx_bitmap = 0;
+		wlvif->sta.ba_rx_bitmap = 0;
 	}
 
 	for (i = 0; i < NUM_TX_QUEUES; i++)