rndis_wlan: avoid uninitialized var warning in rndis_wlan_craft_connected_bss

  CC [M]  drivers/net/wireless/rndis_wlan.o
drivers/net/wireless/rndis_wlan.c: In function ‘rndis_wlan_craft_connected_bss’:
drivers/net/wireless/rndis_wlan.c:2542:2: warning: ‘ret’ may be used uninitialized in this function
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Acked-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>

drivers/net/wireless/rndis_wlan.c

@@ -2536,7 +2536,7 @@ static void rndis_wlan_craft_connected_bss(struct usbnet *usbdev, u8 *bssid,
 	/* Get signal quality, in case of error use rssi=0 and ignore error. */
 	len = sizeof(rssi);
 	rssi = 0;
-	rndis_query_oid(usbdev, OID_802_11_RSSI, &rssi, &len);
+	ret = rndis_query_oid(usbdev, OID_802_11_RSSI, &rssi, &len);
 	signal = level_to_qual(le32_to_cpu(rssi));
 
 	netdev_dbg(usbdev->net, "%s(): OID_802_11_RSSI -> %d, "