cleanup with clang -Wpedantic

attributes/maestro-schema.c

include/maestro/i_cdo.h

maestro/cdo.c

maestro/logging.c

maestro/ofi.c

maestro/pool_manager_ofi.c

maestro/pool_manager_registry.c

tests/cheat.h

tests/check_pool_local_multi.c

tests/check_pool_local_putget.c

tests/check_schema_parse.c

tests/demo_mvp_d3_2.c

tests/simple_interlock_client.c