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

[baomingtong001@208suo.com]

fix the following coccicheck warning:

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

Signed-off-by: Mingtong Bao <baomingtong001@208suo.com>
---
  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;

  }