Btrfs: sysfs: fix, fs_info kobject_unregister has init_completion() twice

kobject_unregister is to handle the release of the kobject,
its completion init is being called in btrfs_sysfs_add_one(),
so we don't have to do the same in the open_ctree() again.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>

fs/btrfs/disk-io.c

@@ -2494,7 +2494,6 @@ int open_ctree(struct super_block *sb,
 	seqlock_init(&fs_info->profiles_lock);
 	init_rwsem(&fs_info->delayed_iput_sem);
 
-	init_completion(&fs_info->kobj_unregister);
 	INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 	INIT_LIST_HEAD(&fs_info->space_info);
 	INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);