btrfs: fix transaction handle leaks in btrfs_last_identity_remap_gone()

btrfs_abort_transaction(), unlike btrfs_commit_transaction(), doesn't
also free the transaction handle. Fix the instances in
btrfs_last_identity_remap_gone() where we're also leaking the
transaction on abort.

Reported-by: Chris Mason <clm@fb.com>
Link: https://lore.kernel.org/linux-btrfs/20260125125129.2245240-1-clm@meta.com/
Fixes: 979e1dc ("btrfs: handle deletions from remapped block group")
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Mark Harmstone <mark@harmstone.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: maharmstone

fs/btrfs/relocation.c

@@ -4723,6 +4723,7 @@ int btrfs_last_identity_remap_gone(struct btrfs_chunk_map *chunk_map,
 	ret = btrfs_remove_dev_extents(trans, chunk_map);
 	if (unlikely(ret)) {
 		btrfs_abort_transaction(trans, ret);
+		btrfs_end_transaction(trans);
 		return ret;
 	}
 
@@ -4732,6 +4733,7 @@ int btrfs_last_identity_remap_gone(struct btrfs_chunk_map *chunk_map,
 		if (unlikely(ret)) {
 			mutex_unlock(&trans->fs_info->chunk_mutex);
 			btrfs_abort_transaction(trans, ret);
+			btrfs_end_transaction(trans);
 			return ret;
 		}
 	}
@@ -4750,6 +4752,7 @@ int btrfs_last_identity_remap_gone(struct btrfs_chunk_map *chunk_map,
 	ret = remove_chunk_stripes(trans, chunk_map, path);
 	if (unlikely(ret)) {
 		btrfs_abort_transaction(trans, ret);
+		btrfs_end_transaction(trans);
 		return ret;
 	}