[PATCH] btrfs: turn btrfs_destroy_all_ordered_extents() into void functions

[Yang Li]

These functions always return '0' and no callers use the return
value. So make it a void function.
It fixes the following warning detected by coccinelle:
./fs/btrfs/disk-io.c:4522:5-8: Unneeded variable: "ret". Return "0" on
line 4530

Reported-by: Abaci Robot <ab...@linux.alibaba.com>
Signed-off-by: Yang Li <yang....@linux.alibaba.com>
---
 fs/btrfs/disk-io.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 41b718c..7c9e1b4 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4513,13 +4513,12 @@ 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;
 
@@ -4527,7 +4526,7 @@ 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) {
@@ -4593,7 +4592,7 @@ 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