usb: gadget: pxa27x: Remove redundant assignment to is_short and dev

Variable is_short is set to zero but this value is never read as it is
overwritten with a new value later on, hence it is a redundant
assignment and can be removed.  Pointer dev is assigned a value that
is not read and it is updated a few statements later, this too is
redundant and can be removed. Cleans up clan warnings:

drivers/usb/gadget/udc/pxa27x_udc.c:986:3: warning: Value stored
to 'is_short' is never read
drivers/usb/gadget/udc/pxa27x_udc.c:1141:2: warning: Value stored
to 'dev' is never read
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/gadget/udc/pxa27x_udc.c

@@ -979,8 +979,6 @@ static int write_fifo(struct pxa_ep *ep, struct pxa27x_request *req)
 
 	max = ep->fifo_size;
 	do {
-		is_short = 0;
-
 		udccsr = udc_ep_readl(ep, UDCCSR);
 		if (udccsr & UDCCSR_PC) {
 			ep_vdbg(ep, "Clearing Transmit Complete, udccsr=%x\n",
@@ -1134,7 +1132,6 @@ static int pxa_ep_queue(struct usb_ep *_ep, struct usb_request *_req,
 	if (unlikely(!_ep))
 		return -EINVAL;
 
-	dev = udc_usb_ep->dev;
 	ep = udc_usb_ep->pxa_ep;
 	if (unlikely(!ep))
 		return -EINVAL;