btrfs: remove unused members dir_path from recorded_ref

The two members do not seem to be used since the initial commit.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/send.c

@@ -2769,12 +2769,10 @@ static int send_create_inode_if_needed(struct send_ctx *sctx)
 
 struct recorded_ref {
 	struct list_head list;
-	char *dir_path;
 	char *name;
 	struct fs_path *full_path;
 	u64 dir;
 	u64 dir_gen;
-	int dir_path_len;
 	int name_len;
 };
 
@@ -2798,12 +2796,6 @@ static int __record_ref(struct list_head *head, u64 dir,
 
 	ref->name = (char *)kbasename(ref->full_path->start);
 	ref->name_len = ref->full_path->end - ref->name;
-	ref->dir_path = ref->full_path->start;
-	if (ref->name == ref->full_path->start)
-		ref->dir_path_len = 0;
-	else
-		ref->dir_path_len = ref->full_path->end -
-				ref->full_path->start - 1 - ref->name_len;
 
 	list_add_tail(&ref->list, head);
 	return 0;