Set slot index to current post-processing slot index.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
---
 drivers/block/zram/zram_drv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index bc268670f852..0a5f11e0c523 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1015,6 +1015,7 @@ static int zram_writeback_slots(struct zram *zram,
 			}
 		}
 
+		index = pps->index;
 		zram_slot_lock(zram, index);
 		/*
 		 * scan_slots() sets ZRAM_PP_SLOT and relases slot lock, so
-- 
2.52.0.rc1.455.g30608eb744-goog