btrfs: abort transaction on errors in btrfs_free_chunk()

The errors during removing a chunk item are fatal, we expect to have a
matching item in the chunk map from which the chunk_offset is taken.
Handle that by transaction abort.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>