staging: gdm724x: redundant variables idProduct and idVendor

Variable idProduct and idVendor are being assigned but are never used
hence they are redundant and can be removed.

Cleans up clang warnings:
warning: variable 'idProduct' set but not used [-Wunused-but-set-variable]
warning: variable 'idVendor' set but not used [-Wunused-but-set-variable]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/gdm724x/gdm_usb.c

@@ -879,14 +879,9 @@ static void gdm_usb_disconnect(struct usb_interface *intf)
 {
 	struct phy_dev *phy_dev;
 	struct lte_udev *udev;
-	u16 idVendor, idProduct;
 	struct usb_device *usbdev;
 
 	usbdev = interface_to_usbdev(intf);
-
-	idVendor = __le16_to_cpu(usbdev->descriptor.idVendor);
-	idProduct = __le16_to_cpu(usbdev->descriptor.idProduct);
-
 	phy_dev = usb_get_intfdata(intf);
 
 	udev = phy_dev->priv_dev;