writeback: remove 'range_cyclic' argument for wb_start_writeback()

All the callers pass in 'true' for range_cyclic, so kill the
argument.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0b9c5cb..dede533 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1994,8 +1994,8 @@
 	rcu_read_lock();
 	list_for_each_entry_rcu(wb, &q->backing_dev_info->wb_list, bdi_node)
 		if (wb_has_dirty_io(wb))
-			wb_start_writeback(wb, nr_pages, true,
-					   WB_REASON_LAPTOP_TIMER);
+			wb_start_writeback(wb, nr_pages,
+						WB_REASON_LAPTOP_TIMER);
 	rcu_read_unlock();
 }