btrfs: fix backport of 2175bf5 in 5.4.95

There's a mistake in backport of upstream commit 2175bf5 ("btrfs:
fix possible free space tree corruption with online conversion") as
5.4.95 commit e1ae9aa.

The enum value BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED has been added to the
wrong enum set, colliding with value of BTRFS_FS_QUOTA_ENABLE. This
could cause problems during the tree conversion, where the quotas
wouldn't be set up properly but the related code executed anyway due to
the bit set.

Link: https://lore.kernel.org/linux-btrfs/20210219111741.95DD.409509F4@e16-tech.com
Reported-by: Wang Yugui <wangyugui@e16-tech.com>
CC: stable@vger.kernel.org # 5.4.95+
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: kdave

fs/btrfs/ctree.h

@@ -136,9 +136,6 @@ enum {
 	BTRFS_FS_STATE_DEV_REPLACING,
 	/* The btrfs_fs_info created for self-tests */
 	BTRFS_FS_STATE_DUMMY_FS_INFO,
-
-	/* Indicate that we can't trust the free space tree for caching yet */
-	BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
 };
 
 #define BTRFS_BACKREF_REV_MAX		256
@@ -527,6 +524,9 @@ enum {
 	 * so we don't need to offload checksums to workqueues.
 	 */
 	BTRFS_FS_CSUM_IMPL_FAST,
+
+	/* Indicate that we can't trust the free space tree for caching yet */
+	BTRFS_FS_FREE_SPACE_TREE_UNTRUSTED,
 };
 
 struct btrfs_fs_info {