[PATCH] btrfs: remove unneeded variable from unpin_extent_cache()

[baomingtong001]

fix the following coccicheck warning:

fs/btrfs/extent_map.c:298:5-8: Unneeded variable: "ret". Return "0".

Signed-off-by: Mingtong Bao <baomingtong001@xxxxxxxxxx>
---
 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 0cdb3e86f29b..f3e9aaeb9956 100644
--- a/fs/btrfs/extent_map.c
+++ b/fs/btrfs/extent_map.c
@@ -295,7 +295,6 @@ 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;

@@ -327,7 +326,7 @@ 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;

 }