usb: gadget: net2280: remove unused DMA_ADDR_INVALID

DMA_ADDR_INVALID isn't used anymore, it's safe
to remove it.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/net2280.c

@@ -65,7 +65,6 @@
 #define	DRIVER_DESC		"PLX NET228x USB Peripheral Controller"
 #define	DRIVER_VERSION		"2005 Sept 27"
 
-#define	DMA_ADDR_INVALID	(~(dma_addr_t)0)
 #define	EP_DONTUSE		13	/* nonzero */
 
 #define USE_RDK_LEDS		/* GPIO pins control three LEDs */
@@ -406,7 +405,6 @@ net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
 	if (!req)
 		return NULL;
 
-	req->req.dma = DMA_ADDR_INVALID;
 	INIT_LIST_HEAD (&req->queue);
 
 	/* this dma descriptor may be swapped with the previous dummy */
@@ -420,7 +418,6 @@ net2280_alloc_request (struct usb_ep *_ep, gfp_t gfp_flags)
 			return NULL;
 		}
 		td->dmacount = 0;	/* not VALID */
-		td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
 		td->dmadesc = td->dmaaddr;
 		req->td = td;
 	}
@@ -2788,7 +2785,6 @@ static int net2280_probe (struct pci_dev *pdev, const struct pci_device_id *id)
 			goto done;
 		}
 		td->dmacount = 0;	/* not VALID */
-		td->dmaaddr = cpu_to_le32 (DMA_ADDR_INVALID);
 		td->dmadesc = td->dmaaddr;
 		dev->ep [i].dummy = td;
 	}