oggz_tell_granulepos now returns -1 for header packets, and when the gp is unknowable (i.e. before the first packet with a gp in the stream)
oggz_tell_granulepos now returns -1 for header packets, and when the gp is
unknowable (i.e. before the first packet with a gp in the stream)



git-svn-id: ed696e516b63563c8842837a624e30c98be77b3c@2815 8158c8cd-e7e1-0310-9fa4-c5954c97daef

brion/liboggz,brion/liboggz,brion/liboggz,kfish/liboggz,kfish/liboggz,brion/liboggz,kfish/liboggz