view libtests/notes @ 472:0f96ad351990 api-inversion

Clean up some compiler warnings.

Yes, we must check return values from read(2).  Make
audiodb_track_id_datum() be more paranoid, and audiodb_free_datum()
defend against potential double-frees as well (even though we're not
exposing that issue at this point).

test 23 in original: is there a testquery point missing?

ask Christophe about 24: testtimes file has 1 entry too many