lib/bitmap: remove bitmap_ord_to_pos

Now that we have find_nth_bit(), we can drop bitmap_ord_to_pos().

Signed-off-by: Yury Norov <yury.norov@gmail.com>

include/linux/nodemask.h

@@ -508,8 +508,7 @@ static inline int node_random(const nodemask_t *maskp)
 
 	w = nodes_weight(*maskp);
 	if (w)
-		bit = bitmap_ord_to_pos(maskp->bits,
-			get_random_int() % w, MAX_NUMNODES);
+		bit = find_nth_bit(maskp->bits, MAX_NUMNODES, get_random_int() % w);
 	return bit;
 #else
 	return 0;