dm snapshot: drop unused last_percent

The last_percent field is unused - remove it.
(It dates from when events were triggered as each X% filled up.)

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

drivers/md/dm-snap.c

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 4ed9b7a..b2d9d1a 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -600,7 +600,6 @@
 
 	s->valid = 1;
 	s->active = 0;
-	s->last_percent = 0;
 	init_rwsem(&s->lock);
 	spin_lock_init(&s->pe_lock);
 	s->ti = ti;

drivers/md/dm-snap.h

diff --git a/drivers/md/dm-snap.h b/drivers/md/dm-snap.h
index 292c156..49c17bf 100644
--- a/drivers/md/dm-snap.h
+++ b/drivers/md/dm-snap.h
@@ -158,9 +158,6 @@
 	/* Used for display of table */
 	char type;
 
-	/* The last percentage we notified */
-	int last_percent;
-
 	mempool_t *pending_pool;
 
 	struct exception_table pending;