Three minor cleanup patches [PATCH 1/4] SQUASHME: nfsd41: use bool inuse for slot state [PATCH 2/4] SQUASHME: nfsd41: use boolean values for use_exchange_id argument [PATCH 4/4] SQUASHME: nfsd4_has_session should return a boolean, not u32 and a bug fix [PATCH 3/4] SQUASHME: fix set_max_drc calculation of sv_drc_max_pages Benny