btrfs: move misplaced comment of btrfs_path::keep_locks

Commit 925baed ("Btrfs: Start btree concurrency work.") added the
comment for the field keep_locks. This got moved later but without the
comment, so move it to the right place and fix the comment style.

Signed-off-by: Sun YangKai <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: SaltyKitkat

fs/btrfs/ctree.h

@@ -61,14 +61,14 @@ struct btrfs_path {
 	/* if there is real range locking, this locks field will change */
 	u8 locks[BTRFS_MAX_LEVEL];
 	u8 reada;
-	/* keep some upper locks as we walk down */
 	u8 lowest_level;
 
 	/*
 	 * set by btrfs_split_item, tells search_slot to keep all locks
 	 * and to force calls to keep space in the nodes
 	 */
 	unsigned int search_for_split:1;
+	/* Keep some upper locks as we walk down. */
 	unsigned int keep_locks:1;
 	unsigned int skip_locking:1;
 	unsigned int search_commit_root:1;