btrfs: fix a leaked chunk map issue in read_one_chunk()

Add btrfs_free_chunk_map() to free the memory allocated
by btrfs_alloc_chunk_map() if btrfs_add_chunk_map() fails.

Fixes: 7dc66ab ("btrfs: use a dedicated data structure for chunk maps")
CC: [email protected]
Reviewed-by: Qu Wenruo <[email protected]>
Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Haoxiang Li <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: Haoxiang Li

fs/btrfs/volumes.c

@@ -7151,6 +7151,7 @@ static int read_one_chunk(struct btrfs_key *key, struct extent_buffer *leaf,
 		btrfs_err(fs_info,
 			  "failed to add chunk map, start=%llu len=%llu: %d",
 			  map->start, map->chunk_len, ret);
+		btrfs_free_chunk_map(map);
 	}
 
 	return ret;