staging: rtl8712: remove redundant pointer 'nic'

Pointer 'nic' is being assigned but is never used hence it is
redundant and can be removed.

Cleans up clang warning:
warning: variable 'nic' 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/rtl8712/rtl8712_led.c

@@ -89,9 +89,6 @@ static void BlinkWorkItemCallback(struct work_struct *work);
 static void InitLed871x(struct _adapter *padapter, struct LED_871x *pLed,
 		 enum LED_PIN_871x	LedPin)
 {
-	struct  net_device *nic;
-
-	nic = padapter->pnetdev;
 	pLed->padapter = padapter;
 	pLed->LedPin = LedPin;
 	pLed->CurrLedState = LED_STATE_OFF;