usb: gadget: at91_udc: Remove unneeded variable

at91_wakeup is always returning -EINVAL.

But usb_gadget_wakeup expects 0 on success and negative number on
failure. As per current implementation this function wont fail.

This patch removes unneeded variable and returns 0.

Issue identified by coccicheck

drivers/usb/gadget/udc/at91_udc.c:802:6-12:
Unneeded variable: "status". Return "- EINVAL" on line 821
Signed-off-by: Hariprasad Kelam <hariprasad.kelam@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/udc/at91_udc.c

@@ -799,7 +799,6 @@ static int at91_wakeup(struct usb_gadget *gadget)
 {
 	struct at91_udc	*udc = to_udc(gadget);
 	u32		glbstate;
-	int		status = -EINVAL;
 	unsigned long	flags;
 
 	DBG("%s\n", __func__ );
@@ -818,7 +817,7 @@ static int at91_wakeup(struct usb_gadget *gadget)
 
 done:
 	spin_unlock_irqrestore(&udc->lock, flags);
-	return status;
+	return 0;
 }
 
 /* reinit == restore initial software state */