btrfs: defrag: remove pointless list_del_init() in defrag_one_cluster()

There's no need to call list_del_init() against each entry when freeing
the list, as the list is local and we are freeing the entry.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>

Author: fdmanana

fs/btrfs/defrag.c

@@ -1319,10 +1319,8 @@ static int defrag_one_cluster(struct btrfs_inode *inode,
 				      inode->root->fs_info->sectorsize_bits;
 	}
 out:
-	list_for_each_entry_safe(entry, tmp, &target_list, list) {
-		list_del_init(&entry->list);
+	list_for_each_entry_safe(entry, tmp, &target_list, list)
 		kfree(entry);
-	}
 	if (ret >= 0)
 		*last_scanned_ret = max(*last_scanned_ret, start + len);
 	return ret;