qcow2: Remove BDS parameter from qcow2_cache_table_release()

qcow2: Remove BDS parameter from qcow2_cache_table_release()

This function was only using the BlockDriverState parameter to get the
cache table size (since it was equal to the cluster size). This is no
longer necessary so this parameter can be removed.

Signed-off-by: Alberto Garcia <[email protected]>
Reviewed-by: Eric Blake <[email protected]>
Reviewed-by: Max Reitz <[email protected]>
Message-id: 7c1b262344375d52544525f85bbbf0548d5ba575.1517840876[email protected]
Signed-off-by: Max Reitz <[email protected]>