dm writecache: remove unused member pointer in writeback_struct

[Huaisheng Ye]

From: Huaisheng Ye <yehs1@xxxxxxxxxx>

The stucture member pointer page in writeback_struct never has been
used actually. Remove it.

Signed-off-by: Huaisheng Ye <yehs1@xxxxxxxxxx>
---
 drivers/md/dm-writecache.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c
index 1cb137f..5c7009d 100644
--- a/drivers/md/dm-writecache.c
+++ b/drivers/md/dm-writecache.c
@@ -190,7 +190,6 @@ struct writeback_struct {
 	struct dm_writecache *wc;
 	struct wc_entry **wc_list;
 	unsigned wc_list_n;
-	struct page *page;
 	struct wc_entry *wc_list_inline[WB_LIST_INLINE];
 	struct bio bio;
 };
-- 
1.8.3.1