staging: wilc1000: isr_bh_routine: remove unused variable nic

This patch removes unused variable nic.
Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/linux_wlan.c

@@ -242,10 +242,6 @@ static irqreturn_t isr_uh_routine(int irq, void *user_data)
 
 irqreturn_t isr_bh_routine(int irq, void *userdata)
 {
-	struct wilc *nic;
-
-	nic = (struct wilc *)userdata;
-
 	/*While mac is closing cacncel the handling of any interrupts received*/
 	if (g_linux_wlan->close) {
 		PRINT_ER("Driver is CLOSING: Can't handle BH interrupt\n");