qca-wifi: Fix use after free when bpr flag enabled

tx capture flag check added and corresponding check added
during skb free.

Change-Id: I5f367b59fd715a56766fa5614b650c6486197775

dp/wifi3.0/dp_tx_capture.c

@@ -116,7 +116,7 @@ void dp_deliver_mgmt_frm(struct dp_pdev *pdev, qdf_nbuf_t nbuf)
 		dp_wdi_event_handler(WDI_EVENT_TX_MGMT_CTRL, pdev->soc,
 				     nbuf, HTT_INVALID_PEER,
 				     WDI_NO_VAL, pdev->pdev_id);
-	} else {
+	} else if (pdev->tx_capture_enabled) {
 		if (pdev->mgmtctrl_frm_info.last_nbuf)
 			qdf_nbuf_free(pdev->mgmtctrl_frm_info.last_nbuf);