[PATCH -next] carl9170: remove set but not used variable 'udev'

[YueHaibing]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/wireless/ath/carl9170/usb.c: In function carl9170_usb_disconnect:
drivers/net/wireless/ath/carl9170/usb.c:1110:21:
 warning: variable udev set but not used [-Wunused-but-set-variable]

It is not use since commit feb09b293327 ("carl9170:
fix misuse of device driver API")

Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/net/wireless/ath/carl9170/usb.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/wireless/ath/carl9170/usb.c 
b/drivers/net/wireless/ath/carl9170/usb.c
index 99f1897..486957a 100644
--- a/drivers/net/wireless/ath/carl9170/usb.c
+++ b/drivers/net/wireless/ath/carl9170/usb.c
@@ -1107,12 +1107,10 @@ static int carl9170_usb_probe(struct usb_interface 
*intf,
 static void carl9170_usb_disconnect(struct usb_interface *intf)
 {
        struct ar9170 *ar = usb_get_intfdata(intf);
-       struct usb_device *udev;
 
        if (WARN_ON(!ar))
                return;
 
-       udev = ar->udev;
        wait_for_completion(&ar->fw_load_wait);
 
        if (IS_INITIALIZED(ar)) {
-- 
2.7.4