[sqlite] just set avformat_info::duration to 0 for now
[sqlite] just set avformat_info::duration to 0 for now

iTunes does it for some tracks, this makes the code simpler and I
suspect it's only useful for gapless playback

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