[PATCH] fs:btrfs: remove unneeded variable

[cgel . zte]

From: chiminghao <chi.ming...@zte.com.cn>

Fix the following coccicheck REVIEW:
./fs/btrfs/extent_map.c:299:5-8 REVIEW Unneeded variable

Reported-by: Zeal Robot <zea...@zte.com.cm>
Signed-off-by: chiminghao <chi.ming...@zte.com.cn>
---
 fs/btrfs/extent_map.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c
index 5a36add21305..1dcb5486ccb6 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -296,7 +296,6 @@ static void try_merge_map(struct extent_map_tree *tree, 
struct extent_map *em)
 int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len,
                       u64 gen)
 {
-       int ret = 0;
        struct extent_map *em;
        bool prealloc = false;
 
@@ -328,7 +327,7 @@ int unpin_extent_cache(struct extent_map_tree *tree, u64 
start, u64 len,
        free_extent_map(em);
 out:
        write_unlock(&tree->lock);
-       return ret;
+       return 0;
 
 }
 
-- 
2.25.1