[PATCH] dm persistent data: Remove unused variable ret

[Jiapeng Chong]

Fix the following coccicheck warnings:

./drivers/md/persistent-data/dm-btree-spine.c:188:5-6: Unneeded
variable: "r". Return "0" on line 194.

Reported-by: Abaci Robot <abaci@xxxxxxxxxxxxxxxxx>
Signed-off-by: Jiapeng Chong <jiapeng.chong@xxxxxxxxxxxxxxxxx>
---
 drivers/md/persistent-data/dm-btree-internal.h | 2 +-
 drivers/md/persistent-data/dm-btree-spine.c    | 6 ++----
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/md/persistent-data/dm-btree-internal.h b/drivers/md/persistent-data/dm-btree-internal.h
index fe073d9..d0c5591 100644
--- a/drivers/md/persistent-data/dm-btree-internal.h
+++ b/drivers/md/persistent-data/dm-btree-internal.h
@@ -83,7 +83,7 @@ struct shadow_spine {
 };
 
 void init_shadow_spine(struct shadow_spine *s, struct dm_btree_info *info);
-int exit_shadow_spine(struct shadow_spine *s);
+void exit_shadow_spine(struct shadow_spine *s);
 
 int shadow_step(struct shadow_spine *s, dm_block_t b,
 		struct dm_btree_value_type *vt);
diff --git a/drivers/md/persistent-data/dm-btree-spine.c b/drivers/md/persistent-data/dm-btree-spine.c
index 8a2bfbf..dd2ff3c 100644
--- a/drivers/md/persistent-data/dm-btree-spine.c
+++ b/drivers/md/persistent-data/dm-btree-spine.c
@@ -183,15 +183,13 @@ void init_shadow_spine(struct shadow_spine *s, struct dm_btree_info *info)
 	s->count = 0;
 }
 
-int exit_shadow_spine(struct shadow_spine *s)
+void exit_shadow_spine(struct shadow_spine *s)
 {
-	int r = 0, i;
+	int i;
 
 	for (i = 0; i < s->count; i++) {
 		unlock_block(s->info, s->nodes[i]);
 	}
-
-	return r;
 }
 
 int shadow_step(struct shadow_spine *s, dm_block_t b,
-- 
1.8.3.1