staging: wilc1000: remove unused variable

wilc_sdio_func is not used anymore so just delete it.
Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/linux_wlan_sdio.c

@@ -11,8 +11,6 @@
 
 #define SDIO_MODALIAS "wilc1000_sdio"
 
-static struct sdio_func *wilc_sdio_func;
-
 #define SDIO_VENDOR_ID_WILC 0x0296
 #define SDIO_DEVICE_ID_WILC 0x5347
 
@@ -105,7 +103,6 @@ static int linux_sdio_probe(struct sdio_func *func, const struct sdio_device_id
 	}
 
 	PRINT_D(INIT_DBG, "Initializing netdev\n");
-	wilc_sdio_func = func;
 	if (wilc_netdev_init(&wilc, &func->dev, HIF_SDIO, gpio,
 			     &wilc_hif_sdio)) {
 		PRINT_ER("Couldn't initialize netdev\n");