Fix the following coccicheck warnings:

./fs/btrfs/disk-io.c:4403:5-8: Unneeded variable: "ret". Return "0" on
line 4411.

Reported-by: Abaci Robot <ab...@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.ch...@linux.alibaba.com>
---
 fs/btrfs/disk-io.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 07a2b4f..78ac205 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -52,7 +52,7 @@
 
 static void end_workqueue_fn(struct btrfs_work *work);
 static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
-static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
+static void btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
                                      struct btrfs_fs_info *fs_info);
 static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
 static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
@@ -4394,13 +4394,12 @@ static void btrfs_destroy_all_ordered_extents(struct 
btrfs_fs_info *fs_info)
        btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
 }
 
-static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
+static void btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
                                      struct btrfs_fs_info *fs_info)
 {
        struct rb_node *node;
        struct btrfs_delayed_ref_root *delayed_refs;
        struct btrfs_delayed_ref_node *ref;
-       int ret = 0;
 
        delayed_refs = &trans->delayed_refs;
 
@@ -4408,7 +4407,7 @@ static int btrfs_destroy_delayed_refs(struct 
btrfs_transaction *trans,
        if (atomic_read(&delayed_refs->num_entries) == 0) {
                spin_unlock(&delayed_refs->lock);
                btrfs_debug(fs_info, "delayed_refs has NO entry");
-               return ret;
+               return;
        }
 
        while ((node = rb_first_cached(&delayed_refs->href_root)) != NULL) {
@@ -4474,7 +4473,7 @@ static int btrfs_destroy_delayed_refs(struct 
btrfs_transaction *trans,
 
        spin_unlock(&delayed_refs->lock);
 
-       return ret;
+       return;
 }
 
 static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
-- 
1.8.3.1

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