don't free albums and artists hashes after writing mhli/mhla
don't free albums and artists hashes after writing mhli/mhla

We will reuse them in more place than just mhli/mhla, and it's not really
useful to do it there anyway since it will be done before exiting
itdb_write_file_internal.

hyperair/libgpod,neuschaefer/libgpod,hyperair/libgpod,hyperair/libgpod,neuschaefer/libgpod,hyperair/libgpod,hyperair/libgpod,neuschaefer/libgpod,neuschaefer/libgpod,neuschaefer/libgpod