staging: ozwpan: Convert hard coded value to Macro

Use macro instead of hard coded value for readability.
Signed-off-by: Rupesh Gujare <rupesh.gujare@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ozwpan/ozhcd.c

@@ -73,6 +73,7 @@ struct oz_urb_link {
 
 /* Holds state information about a USB endpoint.
  */
+#define OZ_EP_BUFFER_SIZE_ISOC  (1024 * 24)
 struct oz_endpoint {
 	struct list_head urb_list;	/* List of oz_urb_link items. */
 	struct list_head link;		/* For isoc ep, links in to isoc
@@ -1261,7 +1262,7 @@ static int oz_build_endpoints_for_interface(struct usb_hcd *hcd,
 			switch (hep->desc.bmAttributes &
 						USB_ENDPOINT_XFERTYPE_MASK) {
 			case USB_ENDPOINT_XFER_ISOC:
-				buffer_size = 24*1024;
+				buffer_size = OZ_EP_BUFFER_SIZE_ISOC;
 				break;
 			case USB_ENDPOINT_XFER_INT:
 				buffer_size = 128;