[PATCH v2 -next] USB: core: remove set but not used variable 'udev'

[YueHaibing]

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

drivers/usb/core/driver.c: In function 'usb_driver_claim_interface':
drivers/usb/core/driver.c:513:21: warning:
 variable 'udev' set but not used [-Wunused-but-set-variable]

Since commit c183813fcee44a24 ("USB: remove LPM management from 
usb_driver_claim_interface()"), 'udev' is not used.

Signed-off-by: YueHaibing <yuehaib...@huawei.com>
Acked-by: Alan Stern <st...@rowland.harvard.edu>
---
v2: add fixes commit info
---
 drivers/usb/core/driver.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c
index a1f225f..5356438 100644
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -510,7 +510,6 @@ int usb_driver_claim_interface(struct usb_driver *driver,
                                struct usb_interface *iface, void *priv)
 {
        struct device *dev;
-       struct usb_device *udev;
        int retval = 0;
 
        if (!iface)
@@ -524,8 +523,6 @@ int usb_driver_claim_interface(struct usb_driver *driver,
        if (!iface->authorized)
                return -ENODEV;
 
-       udev = interface_to_usbdev(iface);
-
        dev->driver = &driver->drvwrap.driver;
        usb_set_intfdata(iface, priv);
        iface->needs_binding = 0;