ath6kl: fix missing copy of action frame contents

The wpa_supplicant was receiving incorrect frame contents in the
callback function that indicates the status of the frame transmitted.
This patch fixes a missing copy of the frame contents to a local
buffer. The local buffer keeps track of the last sent management frame.

Signed-off-by: Aarthi Thiruvengadam <athiruve@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c
index ddefc8e..1426f61c 100644
--- a/drivers/net/wireless/ath/ath6kl/wmi.c
+++ b/drivers/net/wireless/ath/ath6kl/wmi.c
@@ -2846,6 +2846,7 @@
 	}
 
 	kfree(wmi->last_mgmt_tx_frame);
+	memcpy(buf, data, data_len);
 	wmi->last_mgmt_tx_frame = buf;
 	wmi->last_mgmt_tx_frame_len = data_len;