usb: host: max3421-hcd: constify hc_driver structures

The hc_driver structure is only passed as the first argument to
usb_create_hcd, which is declared as const.  Thus the hc_driver structure
itself can be const.

Done with the help of Coccinelle.

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/max3421-hcd.c

@@ -1811,7 +1811,7 @@ max3421_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
 {
 }
 
-static struct hc_driver max3421_hcd_desc = {
+static const struct hc_driver max3421_hcd_desc = {
 	.description =		"max3421",
 	.product_desc =		DRIVER_DESC,
 	.hcd_priv_size =	sizeof(struct max3421_hcd),