nl80211: Fix memory leak on start radar detection error path

Free nlmsg if failing to start radar detection.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>

src/drivers/driver_nl80211.c

@@ -11527,11 +11527,13 @@ static int nl80211_start_radar_detection(void *priv,
 		goto nla_put_failure;
 
 	ret = send_and_recv_msgs(drv, msg, NULL, NULL);
+	msg = NULL;
 	if (ret == 0)
 		return 0;
 	wpa_printf(MSG_DEBUG, "nl80211: Failed to start radar detection: "
 		   "%d (%s)", ret, strerror(-ret));
 nla_put_failure:
+	nlmsg_free(msg);
 	return -1;
 }