ath10k: fix memory leak

mainline inclusion
from mainline-v5.4
commit b8d17e7d93d2beb89e4f34c59996376b8b544792
category: bugfix
bugzilla: 13690
CVE: CVE-2019-19078

-------------------------------------------------

In ath10k_usb_hif_tx_sg the allocated urb should be released if
usb_submit_urb fails.
Signed-off-by: NNavid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: NKalle Valo <kvalo@codeaurora.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/net/wireless/ath/ath10k/usb.c

@@ -454,6 +454,7 @@ static int ath10k_usb_hif_tx_sg(struct ath10k *ar, u8 pipe_id,
 			ath10k_dbg(ar, ATH10K_DBG_USB_BULK,
 				   "usb bulk transmit failed: %d\n", ret);
 			usb_unanchor_urb(urb);
+			usb_free_urb(urb);
 			ret = -EINVAL;
 			goto err_free_urb_to_pipe;
 		}