maple_tree: use cached node end in mas_destroy()

The node end is set during the walk, so use the resulting end instead of
re-fetching it.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Liam R. Howlett <[email protected]>
Cc: Peng Zhang <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

lib/maple_tree.c

@@ -5576,7 +5576,7 @@ void mas_destroy(struct ma_state *mas)
 
 		mas_start(mas);
 		mtree_range_walk(mas);
-		end = mas_data_end(mas) + 1;
+		end = mas->end + 1;
 		if (end < mt_min_slot_count(mas->node) - 1)
 			mas_destroy_rebalance(mas, end);