staging: tidspbridge: use the right type for list_is_last

Removes the following warning:

  CC [M]  drivers/staging/tidspbridge/rmgr/rmm.o
drivers/staging/tidspbridge/rmgr/rmm.c: In function 'rmm_alloc':
drivers/staging/tidspbridge/rmgr/rmm.c:147: warning: passing
	argument 1 of 'list_is_last' from incompatible pointer type
include/linux/list.h:170: note: expected 'const struct list_head *'
	but argument is of type 'struct rmm_ovly_sect *'

Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Ionut Nicu <ionut.nicu@mindbit.ro>

drivers/staging/tidspbridge/rmgr/rmm.c

@@ -144,7 +144,7 @@ int rmm_alloc(struct rmm_target_obj *target, u32 segid, u32 size,
 			new_sect->addr = addr;
 			new_sect->size = size;
 			new_sect->page = segid;
-			if (list_is_last(sect, &target->ovly_list))
+			if (list_is_last(&sect->list_elem, &target->ovly_list))
 				/* Put new section at the end of the list */
 				list_add_tail(&new_sect->list_elem,
 						&target->ovly_list);